P2A36 code meaning
AFCM Power Relay Sense Circuit Low
Powertrain system Generic code P2Axx codes Check engine light
What P2A36 means
P2A36 is set when the relay feeding the gas control module has been commanded on, yet the voltage read back after its contacts stays too low. Burnt or pitted contacts, a high-resistance joint, a grounded sense wire or a blown fuse in the switched path all lead there, as does a weak battery during cranking. For the comparable engine relay code P0689, GM Europe on the 2010 Saab V6 uses a limit of 6 V held for more than 1 s and treats the result as Type C. No public calibration names P2A36 for a gas system. If the module really runs short of voltage, it may reset or drop off the network, which Roush's Ford propane trucks report as U0108; in a bi-fuel car the engine then returns to gasoline.
P2A36 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2A36
- Check engine light, depending on calibration
- Gas mode drops out, bi-fuel vehicle switches to gasoline
- Communication fault with the gas module stored as well
Common causes of P2A36
- Most likelyWorn or burnt relay contacts
- PossibleBlown fuse in the switched supply
- PossibleSense wire shorted to ground
- Less likelyWeak battery or poor main ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Afcm power relayAfcmWiring harness
What each part of P2A36 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| 36 | The exact fault in that area. |
What to do next
- Note P2A36 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 P2A36
What does P2A36 mean?
P2A36 means "AFCM Power Relay Sense Circuit Low". P2A36 is set when the relay feeding the gas control module has been commanded on, yet the voltage read back after its contacts stays too low. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A36?
Drive gently and only to a workshop. With P2A36 the car can go into limp mode (reduced power) to protect itself.
Will P2A36 fail an emissions test?
Yes, it can. P2A36 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2A36 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2A36 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.