U3567 code meaning
Anode Inlet Pressure Sensor 2 Circuit
Network system Generic code U35xx codes Check engine light
What U3567 means
U3567 belongs to the second pressure sensor at the anode inlet. Its signal carries safety weight: GM uses anode pressure to catch an injector stuck open, then shuts the tank valves, opens the anode bleed valve, lifts cathode pressure with compressor and backpressure valve and opens the cathode bypass so hydrogen in the exhaust stays diluted. Another GM patent treats a gap of more than a calibrated margin, typically 3 kPa, between actual and desired pressure as an injector fault. Sensors in this wet zone can ice up, so GM checks the anode sensor before start against ambient pressure plus the anode-to-cathode differential. A second sensor allows a similar comparison while driving. No maker publishes U3567. Expect a warning; with sensor 1 as the only source, power may be reduced. Sensor 1 is U3566.
U3567 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U3567
- Fuel cell system warning, MIL on
- Often no noticeable change while sensor 1 still works
- Reduced power
Common causes of U3567
- Most likelyOpen, short or corrosion in wiring or connector of sensor 2 at the stack
- PossibleAnode inlet pressure sensor 2 faulty internally
- Less likelyWater in the connector, fault mainly after frost
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Anode inlet pressure sensor 2Sensor wiring
What each part of U3567 means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 67 | The exact fault in that area. |
What to do next
- Note U3567 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U3567
What does U3567 mean?
U3567 means "Anode Inlet Pressure Sensor 2 Circuit". U3567 belongs to the second pressure sensor at the anode inlet. It is a generic code, so it means the same on every make.
Is it safe to drive with U3567?
Drive gently and only to a workshop. With U3567 the car can go into limp mode (reduced power) to protect itself.
Will U3567 fail an emissions test?
U3567 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U3567 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U3567 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.