P2B53A Camshaft Profile Actuator B Control Stuck On Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2B53 means actuator B of the bank 1 intake camshaft is caught in the engaged position. GM documents it for the L3B 2.7-litre four as pin stuck: after a shift the Hall feedback must climb back above the retracted level of 68; if extending (55) or extended (45) was seen but the pin never reports home before the engine cycle ends, the ECM logs a stuck-out pin. One failure in five samples is enough, Type A, MIL on the first trip. GM bulletins PIT5677 and 21-NA-149 also list P2B53 among codes a chafed engine harness on 2019–2022 Silverado and Sierra can trigger. A pin left in the groove can hold the sleeve or wear it, so profile switching is disabled. Opposite fault: P2B4F.
- What you may notice
- MIL on in the first drive
- Lift switching and cylinder deactivation locked out
- With a damaged harness also other codes, rough running or blown fuses
- Possible ticking from the valve cover if the pin rubs in the groove
- Likely causes
- LikelyActuator pin does not retract (sticking plunger, varnish, weak spring)
- PossibleEngine harness chafed on the camshaft carrier (GM PIT5677 / 21-NA-149)
- RareHall feedback does not report the home position although the pin is back
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.