P23E9 code meaning
Camshaft A Position Signal Output Circuit/Open (Bank 2)
What P23E9 means
P23E9 concerns a signal the engine control module sends out rather than one it receives: on some engines the ECM passes a conditioned copy of the bank 2 camshaft A position signal on to another module that needs engine phase information. The code flags a broken or otherwise faulty output line, typically an open circuit found when the driver stage is switched. No manufacturer documents P23E9 publicly. GM's tables for the bank 1 counterpart on the 2019 2.0 L LTG show the method: the driver voltage is compared with controller limits, and an open line above about 200 kOhm is caught during the low-circuit check, which is why P2614 may set alongside it. Ground faults belong to P23EA, shorts to voltage to P23EB. The engine itself usually keeps running normally.
P23E9 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P23E9
- Stored code with no noticeable change in engine running
- Fault entries in the module that receives the camshaft signal
- Start-stop or shift functions may be restricted
Common causes of P23E9
- Most likelyBroken wire in the output line to the receiving module
- PossibleTerminal pushed back or corroded in a connector
- PossibleReceiving module unplugged or without its load resistor
- Less likelyFaulty output driver inside the engine control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine control moduleCam position signal a b2 outputWiring harness
What each part of P23E9 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| E9 | The exact fault in that area. |
What to do next
- Note P23E9 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 P23E9
What does P23E9 mean?
P23E9 means "Camshaft A Position Signal Output Circuit/Open (Bank 2)". P23E9 concerns a signal the engine control module sends out rather than one it receives: on some engines the ECM passes a conditioned copy of the bank 2 camshaft A position signal on to another module that needs engine phase information. It is a generic code, so it means the same on every make.
Is it safe to drive with P23E9?
Drive gently and only to a workshop. With P23E9 the car can go into limp mode (reduced power) to protect itself.
Will P23E9 fail an emissions test?
P23E9 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 P23E9 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P23E9 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.