P23EE: Camshaft B Position Signal Output Circuit High (Bank 1)

P23EE flags a camshaft B, bank 1 output line that the ECM cannot pull low: the voltage stays near supply level, pointing to a short to a battery-fed or 5 V wire, a faulty pull-up in the receiving unit or a failed ECM driver transistor. GM documents the test only for the bank 1 camshaft A counterpart P2616 on the 2019 LTG: monitored while the output is commanded low, a short once resistance to power drops to 0.5 ohm or below, a sample every 100 ms, 40 bad results in 50, Type C. No public manufacturer data exist for P23EE. A driver stage exposed to a hard short can overheat, so locating the short before replacing a module matters. Siblings: open circuit P23EC, low P23ED, the bank 2 high fault P23F1.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.

Symptoms

• Code logged while the engine runs normally
• Faults or reduced functions in the module fed by the signal

Most likely causes

• Output line shorted to a battery or sensor supply wire
• Faulty pull-up circuit in the receiving module
• ECM driver transistor burnt out

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the oil level and condition before anything else
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Check the solenoid valve's connector
4. Compare commanded and actual angles in live data
5. Test the solenoid valve and its filter, if it has one
6. Check the engine timing if there is chain noise

Good to know

• Repair difficulty: medium
• It can trigger limp mode.

What each character of P23EE means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 3: Ignition and misfires
• EE: Specific fault in that system

Frequently asked questions

Can I keep driving with code P23EE?

Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.

What causes code P23EE?

The most common causes are: output line shorted to a battery or sensor supply wire; faulty pull-up circuit in the receiving module; eCM driver transistor burnt out.

Related codes

• P23ECCamshaft B Position Signal Output Circuit/Open (Bank 1)
• P23EDCamshaft B Position Signal Output Circuit Low (Bank 1)
• P23EBCamshaft A Position Signal Output Circuit High (Bank 2)
• P23F1Camshaft B Position Signal Output Circuit High (Bank 2)
• P2616Camshaft A Position Signal Output Circuit High (Bank 1)

Sources

• gsi.ext.gm.com: 19OBDG03B Diagnostics
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.