P23EB code meaning
Camshaft A Position Signal Output Circuit High (Bank 2)
What P23EB means
P23EB is the opposite fault to P23EA: the bank 2 camshaft A output line, which the ECM drives as a switched low-side signal for another module, stays high when it should be pulled low. Typical reasons are a wire touching a supply circuit, moisture in a connector or a defective driver in the ECM. GM checks the bank 1 version P2616 while the output is commanded low and declares a short to power at 0.5 ohm or less, with system voltage at least 11 V and 40 of 50 samples failing (Type C, no MIL). Nothing comparable is published for P23EB itself, so these figures only serve as a guide. Unlike sensor codes such as P0345, the engine's own timing is not affected; the risk lies with the module downstream, which loses its phase reference.
P23EB 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 P23EB
- Code present without drivability complaint
- Related fault codes in the receiving control module
- Comfort functions such as start-stop deactivated
Common causes of P23EB
- Most likelyOutput wire shorted to a battery or 5 V supply wire in the harness
- PossibleWater ingress bridging terminals
- Less likelyECM output transistor no longer switching to ground
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 P23EB 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. |
| EB | The exact fault in that area. |
What to do next
- Note P23EB 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 P23EB
What does P23EB mean?
P23EB means "Camshaft A Position Signal Output Circuit High (Bank 2)". P23EB is the opposite fault to P23EA: the bank 2 camshaft A output line, which the ECM drives as a switched low-side signal for another module, stays high when it should be pulled low. It is a generic code, so it means the same on every make.
Is it safe to drive with P23EB?
Drive gently and only to a workshop. With P23EB the car can go into limp mode (reduced power) to protect itself.
Will P23EB fail an emissions test?
P23EB 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 P23EB to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P23EB clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.