P23ED code meaning
Camshaft B Position Signal Output Circuit Low (Bank 1)
What P23ED means
With P23ED the ECM detects that its camshaft B output for bank 1 reads low although it has released the line to go high. Most often a harness section rubbing through to the engine block, a crushed connector pin or a shorted input in the receiving module is to blame. Measured analogies come from GM: the bank 1 camshaft A output code P2615 uses a ground resistance of at most 0.5 ohm, requires the engine to be out of crank and is rated Type C, so no warning lamp. Whether makers who use P23ED light the MIL is not published. Because the sensor feeding the ECM is not involved, replacing the camshaft sensor will not clear the code; a voltage-drop test of the output line between both modules is the sensible first step.
P23ED 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 P23ED
- Code stored, engine performance unaffected
- Downstream module reports missing camshaft signal
- Possible fallback behaviour in transmission or hybrid functions
Common causes of P23ED
- Most likelyHarness rubbed through against the engine block
- PossibleCrushed or bent connector pin touching ground
- PossibleShorted input in the receiving module
- Less likelyECM output stage damaged
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 b b1 outputWiring harness
What each part of P23ED 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. |
| ED | The exact fault in that area. |
What to do next
- Note P23ED 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 P23ED
What does P23ED mean?
P23ED means "Camshaft B Position Signal Output Circuit Low (Bank 1)". With P23ED the ECM detects that its camshaft B output for bank 1 reads low although it has released the line to go high. It is a generic code, so it means the same on every make.
Is it safe to drive with P23ED?
Drive gently and only to a workshop. With P23ED the car can go into limp mode (reduced power) to protect itself.
Will P23ED fail an emissions test?
P23ED 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 P23ED to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P23ED clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.