B1342 Control module internal fault (Ford, Lincoln)

ECU is defective (module internal fault)

B1342 in short

On Ford and Lincoln vehicles, B1342 means a control module has found a fault inside itself. The airbag module, the anti-lock brake module or another module can store it, so which warning light is on matters. Airbag and brake faults need a prompt check, and never probe airbag wiring yourself.

B1342 is a general Ford code. Rather than naming a sensor, it says the module that stored it failed its own self-check. Ford bulletins list it in the restraints control module on the 2001–2005 Windstar, Freestar and Crown Victoria, and in the occupant classification module on the 2007–2008 Ranger.

On other models the same code comes from a different module. Ford and Lincoln bulletins for 2000–2002 vehicles describe B1342 as an anti-lock brake module failure with the ABS lamp lit, and a 2003 Navigator bulletin links it to the power liftgate and running boards.

So the first step is to find out which module stored it. If the airbag light is on, the airbags may not work as designed, and that system is for trained technicians only. Mazda also lists B1342 with an airbag light on the 2007–2008 CX-7 and CX-9, without saying what it means.

Pick your make

B1342 is a manufacturer-specific code: its meaning depends on who built the car.

Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.

Most likely causes

  1. Restraints (airbag) control module internal fault

    Supported by vehicle data
    Why it ranks here
    Ford's bulletin names B1342 a restraints control module fault on the 2001–2005 Windstar, Freestar and Crown Victoria, and an older Explorer and Expedition bulletin links it to an intermittent airbag lamp.
    What would change this
    Rises if the code is stored in the restraints module with the airbag light on. Falls if another module stored it.

  2. Anti-lock brake control module internal fault

    Supported by vehicle data
    Why it ranks here
    Ford and Lincoln bulletins for the 2001 Explorer Sport Trac and 2001 Lincoln LS describe B1342 as an anti-lock brake control module failure with the ABS lamp on.
    What would change this
    Rises if the code is stored in the ABS module with the ABS lamp on. Falls if the ABS module passes its self-test.
    How to test the brake system control module (abs module)

  3. Occupant classification module fault (2007–2008 Ranger)

    Supported by vehicle data
    Why it ranks here
    Ford's bulletin for the 2007–2008 Ranger covers B1342 stored in the occupant classification sensor module.
    What would change this
    Rises on a 2007–2008 Ranger with the code in the occupant classification module. Falls on other models.

  4. A false code that should be cleared, not a failed module (some models)

    Possible — needs testing
    Why it ranks here
    Ford's Econoline bulletin says that when B1342 appears together with C1222, C1115 and C1226, the module should not be replaced and the codes should be cleared. This applies only to that older van.
    What would change this
    Rises on an Econoline with that exact set of codes. Falls if B1342 returns at once after clearing.

What to test first

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

  1. Have every module scanned, not only the engine computer, and note which module stored B1342 and which warning lights are on.

    Low riskTool: scan tool that reads all modules

  2. Ask a Ford, Lincoln or Mazda dealer for bulletins that match your model and the module that stored the code.

    Low risk

  3. Have a trained technician confirm the module fault using the service manual before any module is replaced.

    Best left to a shopTool: maker's diagnostic tool

    Warning:Never probe airbag connectors or wiring with a test light or meter, and never unplug them yourself. Nissan warns that airbags and pretensioners can still deploy after the ignition is off, and that test equipment must not be used on airbag circuits unless the service manual calls for it. Leave this to a dealer or trained technician. Brake modules are safety-critical too.

Symptoms

  • Airbag warning light on or coming on intermittently
  • ABS or traction control warning lamp on
  • Power liftgate or running boards stop working (2003 Navigator)

How to fix

This is a safety-critical system, so we explain the code but don't give repair steps. Have it inspected by a qualified technician.

Parts and cost context

  • Control module (restraints or ABS):B1342 often leads to replacing the module that stored it, but Ford's Econoline bulletin shows it is not always needed. Replacement airbag modules must be the correct part and installed by a technician. Labour 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

Ford

  • 2001–2003 · Windstar

    Supported by vehicle data

    Ford's bulletin names B1342 a restraints control module fault on the Windstar, Freestar and Crown Victoria. Whether it is still current is not verified.

  • 2007–2008 · Ranger

    Supported by vehicle data

    On the Ranger, Ford's bulletin places B1342 in the occupant classification module. Whether it is still current is not verified.

  • 04136Status unverified

    DTC B1342 (restraints control module fault)

    2001–2005windstar, freestar, crown-victoria · issued · NHTSA 10009320

    Service information for B1342 stored in the restraints control module.

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

  • 15106Status unverified

    4WABS lamp with B1342 (anti-lock brake control module failure)

    2001explorer-sport-trac · issued · NHTSA 621122

    Covers 4x4 vehicles with the ABS lamp on and B1342 in self-test.

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

  • 20147Status unverified

    B1342 in the occupant classification sensor module

    2007–2008ranger · issued · NHTSA 10024696

    Service information for B1342 stored in the occupant classification module.

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

  • BC0106960102Status unverified

    False ABS codes on Econoline with 4WABS

    1994–1996econoline · issued · NHTSA 46431

    If B1342, C1222, C1115 and C1226 are all stored, do not replace the module; clear the codes.

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

Lincoln

  • 2001 · LS

    Supported by vehicle data

    On the Lincoln LS, B1342 is described as an anti-lock brake module failure with the ABS lamp on. Whether the bulletin is still current is not verified.

  • 15089Status unverified

    4WABS lamp with B1342 (anti-lock brake control module failure)

    2001ls · issued · NHTSA 621096

    Covers the ABS lamp on with B1342 in self-test.

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

Mazda

  • 2007–2008 · CX-9

    Supported by vehicle data

    Mazda lists B1342 with B2477 and/or C1946 and the airbag light on, below a VIN cut-off. It does not say what B1342 means. Whether the bulletin is still current is not verified.

  • 08-003-08Status unverified

    Airbag warning light with B1342, B2477 and/or C1946

    2007–2008cx-7, cx-9 · issued · NHTSA 10025754

    Covers vehicles below a VIN cut-off with these codes and the airbag light on.

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

No curated relationships for B1342 yet.

All Airbags and seat-belt restraints (SRS) codes

B1342 questions

Does B1342 always mean the airbag module is bad?

No. On Ford and Lincoln it means whichever module stored it found an internal fault; bulletins show it in airbag, ABS, occupant sensing and body modules. A full-module scan shows which one.

Sources and review

  1. 04136: DTC B1342 (restraints control module fault) — Ford Motor Company / NHTSA ,
  2. 15106: 4WABS lamp with DTC B1342 (anti-lock brake control module failure) — Ford Motor Company / NHTSA ,
  3. 2023 Accord Owner's Manual: Airbag System Indicators — American Honda Motor Co.
  4. Camry Owner's Manual (OM06291U) — Toyota
  5. 6640: airbag lamp on intermittently with LFC 24, or DTC B1924 and/or B1342 — Ford Motor Company / NHTSA ,
  6. 15089: 4WABS lamp with DTC B1342 (anti-lock brake control module failure), Lincoln LS — Ford Motor Company / NHTSA ,
  7. 20147: 2007–2008 Ranger, B1342 in occupant classification sensor system module — Ford Motor Company / NHTSA ,
  8. BC0106960102: Econoline with 4WABS false ABS codes B1342, C1222, C1115 and C1226 — Ford Motor Company / NHTSA ,
  9. 17004: inoperative power liftgate and running boards with DTC B1342 (2003 Navigator) — Ford Motor Company / NHTSA ,
  10. 08-003-08: airbag warning light on with B1342, B2477 and/or C1946 (CX-7, CX-9) — Mazda North American Operations / NHTSA ,
  11. Nissan Supplemental Restraint Systems: damage analysis and repair using Diagnostic Trouble Codes (TechNews, Summer 2016) — Nissan North America ,
Last reviewed
Written by
Saurabh K.
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