P0090: Fuel pressure regulator control circuit fault
Fuel pressure regulator 1 control circuit
Severity: Inspect soon
On the Saab/GM procedure P0090 is a Type B code that shows Reduced Engine Power while active, so fuel delivery may be limited.
It gets more serious if:
- Stop: Stop driving if the engine stalls or will not hold power.
P0090 in short
P0090 means the computer sees an electrical fault in the control circuit of the fuel pressure regulator, the actuator that sets fuel pressure. Wiring, connectors or the regulator itself are the usual causes. Some vehicles reduce engine power when it is active, so get it checked soon.
A fuel pressure regulator or pump actuator controls how much fuel pressure the engine gets. The computer drives it through its own circuit.
TaT says the code means an electrical fault in the wiring, connector or driver of that circuit.
On the Saab/GM service procedure, the code sets after one second when actuator voltage reads 1 to 4.5 V while commanded off, and the display shows Reduced Engine Power.
Most likely causes
These are general causes for this code across vehicles. None is specific to one make or model.
Cause 1: Fuel pressure regulator or pump actuator fault
Common general cause- Why it ranks here
- The Saab procedure has you test the actuator and its circuits; TaT names the driver and wiring.
- What would change this
- Rises if the actuator resistance is out of range. Falls if it reads normal.
Cause 2: Wiring or connector open or short
Common general cause- Why it ranks here
- The Saab procedure checks for shorts to ground, opens, and shorts to voltage; TaT names wiring and connector.
- What would change this
- Rises if continuity or voltage checks fail. Falls if the circuit tests good.
Cause 3: Engine computer driver
Possible — needs testing- Why it ranks here
- TaT names the driver; it is only suspect after wiring and actuator.
- What would change this
- Rises if wiring and actuator test good. Falls if either fails.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Read all codes and freeze-frame data and note fuel pressure readings.
IfFuel pressure is wrong or other fuel codes present
It meansHave the circuit tested.
IfPressure is normal
It meansHave the circuit tested.
Step 2: Have a shop check the actuator circuit voltage, continuity and resistance and fuel rail pressure at idle.
Warning:High pressure fuel systems can spray fuel under pressure. Let a shop do it.
IfActuator out of range
It meansActuator fault.
IfWiring open, shorted or wrong voltage
It meansWiring or connector fault.
IfBoth good
It meansDriver or computer.
Symptoms
- Check engine light
- Reduced Engine Power message Gets more serious: stop and have it checked.
- Stalling or poor performance Gets more serious: stop and have it checked.
How to fix
On your vehicle
ChevroletYour car
2024–2025 · Traverse
Supported by vehicle dataChevrolet bulletin PIP6061 names P0090. Preliminary information: a poor connection at the high pressure fuel pump may set P0089, P0090, P00C6, P163A and/or P228C. Inspect and wiggle the harness and repair the connector or terminals as needed. Also listed for Buick Enclave and GMC Acadia. Whether it is still current is not verified.
PIP6061Status unverified
Electrical connection concern at the high pressure fuel pump (Traverse)
2024–2025traverse · issued · NHTSA 11018413
Preliminary information: a poor connection at the high pressure fuel pump may set P0089, P0090, P00C6, P163A and/or P228C. Inspect and wiggle the harness and repair the connector or terminals as needed. Also listed for Buick Enclave and GMC Acadia.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Related codes
No curated relationships for P0090 yet.
P0090 questions
Can I drive with P0090?
Get it checked soon. The GM procedure shows Reduced Engine Power while it is active, and stalling is possible, so do not drive on in traffic with low power.
Sources and review
- DTC P0090, P0091 or P0092 (Saab 9-5 2010, 4-cyl petrol)
- P0090 fault code entry
- Chevrolet PIP6061: Electrical connection concern at the high pressure fuel pump (Traverse)
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error