P0358 The computer found a fault in the primary or secondary circuit of ignition coil H (cylinder 8 by the usual reading)

Ignition Coil H Primary/Secondary Circuit Malfunction

Severity not verified — if the car runs badly, have it inspected

The sources read for this code define it and list causes but do not rate how urgent it is. A coil circuit fault can cause a misfire, so have it checked rather than ignoring it.

Source: how we rate severity

P0358 in short

P0358 means the engine computer found a fault in the primary or secondary circuit of ignition coil H, which the page reads as cylinder 8 (lettering depends on the engine). A failed coil, damaged wiring or a loose connector is the usual cause, and the computer itself is rare. Expect a check engine light and possibly a misfire.

Each ignition coil turns battery voltage into the high voltage that fires a spark plug. The computer watches the coil circuit, and P0358 sets when coil H does not behave as expected.

TroubleCodes.net lists three causes: a faulty coil, wiring or connector trouble in the coil circuit, and, less often, the engine computer. It notes the code often appears with misfire codes P0300 to P0308.

The Delaware DMV list gives the same generic title, so the meaning is the same on every make. Which cylinder the letter points to depends on the engine, so check service information for your vehicle.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

  1. Failed ignition coil

    Common general cause
    Why it ranks here
    TroubleCodes.net lists a faulty coil first among causes of this code.
    What would change this
    Rises if the fault follows the coil when swapped or its resistance is out of range. Falls if it stays with the same cylinder.
    How to test the ignition coil

  2. Damaged wiring or loose connector at the coil

    Common general cause
    Why it ranks here
    TroubleCodes.net lists wiring problems in the coil circuit as the second cause.
    What would change this
    Rises if the connector is corroded, loose or the wiring is damaged. Falls if the wiring tests fine.

  3. Engine computer (PCM) fault

    Possible — needs testing
    Why it ranks here
    TroubleCodes.net lists the computer last and says it is the least likely cause, so rule out the coil and wiring first.
    What would change this
    Rises only after the coil, power and wiring all test good. Falls if any of those is faulty.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all stored codes and freeze-frame data, and note whether misfire codes such as P0300 to P0308 are stored with P0358.

    Low riskTool: OBD-II scan tool

    • IfMisfire codes are stored too

      It meansThe coil circuit fault is probably causing the misfire.

      Go to step 2

    • IfOnly P0358 is stored

      It meansInspect the coil and connector.

      Go to step 2

  2. With the engine off and cool, look at the coil and its connector for broken wires, corrosion or damage, then swap the coil with one from another cylinder and clear the codes.

    Use cautionTool: basic hand tools, scan tool

    Warning:Never touch coils, plug wires or connectors while the engine is running or cranking; ignition voltage can shock you. Let the engine cool before touching parts near the exhaust.

  3. Measure coil resistance (primary about 0.4 to 2 ohms, secondary about 6,000 to 15,000 ohms, per TroubleCodes.net; confirm against your service specs), check for about 12 volts at the coil, and use an LED or noid light to see whether the computer switches the coil while cranking.

    Best left to a shopTool: multimeter, noid light or LED test light

    Warning:Probing coil connectors with the circuit live can short a pin and damage the computer or coil driver, and ignition voltage can shock you. Leave this to a shop unless you have the wiring diagram.

Symptoms

  • Check engine light on
  • Engine misfire, rough running
  • Misfire codes P0300 to P0308 stored with it

Compare with: Rough idle with the check engine light on

How to fix

Parts and cost context

  • Ignition coil:Swap the coil with another cylinder first so you replace the right one. Labor varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Chevrolet

  • 2014 · Silverado

    Supported by vehicle data

    NHTSA flat-file summary of Chevrolet bulletin PIP5147A-chevrolet (summary: a service engine soon lamp with P0300 and P0351 through P0358 on 2014 Silverado 1500 vehicles). Whether it is still current is not verified.

  • 2004 · Colorado

    Supported by vehicle data

    NHTSA flat-file summary of Chevrolet bulletin 01772A-chevrolet (summary: P0351-P0358 are mislabeled, and the code shown on the Tech 2 may not reflect the actual ignition circuit, coil or module, or where the problem is detected). Whether it is still current is not verified.

  • PIP5147A-chevroletStatus unverified

    SES lamp with P0300 and P0351-P0358

    2014silverado-1500 · issued · NHTSA 10253407

    NHTSA flat-file summary only; the full bulletin was not read. The summary mentions a service engine soon lamp with P0300 and P0351 through P0358 on 2014 Silverado 1500 vehicles.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 01772A-chevroletStatus unverified

    Mislabeled P0351-P0358

    2004colorado · issued · NHTSA 10007969

    NHTSA flat-file summary only; the full bulletin was not read. The summary mentions P0351-P0358 are mislabeled, and the code shown on the Tech 2 may not reflect the actual ignition circuit, coil or module, or where the problem is detected.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

GMC

  • 2014 · Sierra

    Supported by vehicle data

    NHTSA flat-file summary of Gmc bulletin PIP5147A-gmc (summary: a service engine soon lamp with P0300 and P0351 through P0358 on 2014 Sierra 1500 vehicles). Whether it is still current is not verified.

  • 2004 · Canyon

    Supported by vehicle data

    NHTSA flat-file summary of Gmc bulletin 01772A-gmc (summary: P0351-P0358 are mislabeled, and the code shown on the Tech 2 may not reflect the actual ignition circuit, coil or module, or where the problem is detected). Whether it is still current is not verified.

  • PIP5147A-gmcStatus unverified

    SES lamp with P0300 and P0351-P0358

    2014sierra-1500 · issued · NHTSA 10253407

    NHTSA flat-file summary only; the full bulletin was not read. The summary mentions a service engine soon lamp with P0300 and P0351 through P0358 on 2014 Sierra 1500 vehicles.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 01772A-gmcStatus unverified

    Mislabeled P0351-P0358

    2004canyon · issued · NHTSA 10007969

    NHTSA flat-file summary only; the full bulletin was not read. The summary mentions P0351-P0358 are mislabeled, and the code shown on the Tech 2 may not reflect the actual ignition circuit, coil or module, or where the problem is detected.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Cadillac

  • 2004 · Deville

    Supported by vehicle data

    NHTSA flat-file summary of Cadillac bulletin 01800 (summary: on the 4.6L LD8/L37 engine, ignition coil codes P0351-P0358 refer to the firing order and not the actual cylinder; the text also lists 2005 Seville and DeVille); and 01772A-cadillac (summary: P0351-P0358 are mislabeled, and the code shown on the Tech 2 may not reflect the actual ignition circuit, coil or module, or where the problem is detected). Whether it is still current is not verified.

  • 01800Status unverified

    P0351-P0358 refer to firing order

    2004deville, seville · issued · NHTSA 10006237

    NHTSA flat-file summary only; the full bulletin was not read. The summary mentions on the 4.6L LD8/L37 engine, ignition coil codes P0351-P0358 refer to the firing order and not the actual cylinder; the text also lists 2005 Seville and DeVille.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 01772A-cadillacStatus unverified

    Mislabeled P0351-P0358

    2004deville, seville · issued · NHTSA 10007969

    NHTSA flat-file summary only; the full bulletin was not read. The summary mentions P0351-P0358 are mislabeled, and the code shown on the Tech 2 may not reflect the actual ignition circuit, coil or module, or where the problem is detected.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Ford

  • 2003–2004 · Thunderbird

    Supported by vehicle data

    NHTSA flat-file summary of Ford bulletin 17382 (summary: a bulletin about diagnostic trouble codes P0300-P0308 or P0350-P0358; the summary gives no further detail). Whether it is still current is not verified.

  • 17382Status unverified

    Codes P0300-P0308 or P0350-P0358

    2003–2004thunderbird · issued · NHTSA 10008194

    NHTSA flat-file summary only; the full bulletin was not read. The summary mentions a bulletin about diagnostic trouble codes P0300-P0308 or P0350-P0358; the summary gives no further detail.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 8077Status unverified

    P0350-P0358 coil codes with rough idle when cold

    2000crown-victoria, econoline, expedition, f-150, super-duty-f-series · issued · NHTSA 612278

    NHTSA flat-file summary only; the full bulletin was not read. The summary mentions some vehicles may show any of P0350 through P0358 coil codes, a lit check engine light and rough idle under cold start conditions.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 8190Status unverified

    P0350-P0358 coil codes with rough idle

    2000crown-victoria, econoline, expedition, f-150, super-duty-f-series · issued · NHTSA 612342

    NHTSA flat-file summary only; the full bulletin was not read. The summary mentions some vehicles may show any of P0350-P0358 coil codes, a lit check engine light and rough idle.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0357The computer found a fault in the primary or secondary circuit of ignition coil G (cylinder 7 by the usual reading)

    Same system Common general cause

    Both are ignition coil primary/secondary circuit codes for different coils.

All Ignition and engine position sensors codes

Sources and review

  1. P0358 trouble code page — TroubleCodes.net
  2. PIP5147A: SES lamp with P0300 and P0351-P0358 — Chevrolet
  3. PIP5147A: SES lamp with P0300 and P0351-P0358 — GMC
  4. 01800: P0351-P0358 refer to firing order — Cadillac
  5. 01772A: Mislabeled P0351-P0358 — Cadillac
  6. 01772A: Mislabeled P0351-P0358 — Chevrolet
  7. 01772A: Mislabeled P0351-P0358 — GMC
  8. 17382: Codes P0300-P0308 or P0350-P0358 — Ford
  9. On-Board Diagnostic Trouble Codes (generic code title list) — Delaware Division of Motor Vehicles
Last reviewed
Written by
Saurabh K.
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