P2B34A Camshaft Profile Actuator B Control Circuit Low 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
- On bank 1 the intake camshaft (A) carries a second shifting solenoid, actuator B, which GM's L3B 2.7-litre four labels actuator 2. P2B34 reports a short to ground on its control line: while the driver is switched on, the ECM measures 0.5 Ω or less from signal to ground and stores the fault after 4 failed out of 5 samples at more than 11 V, lighting the MIL at once (Type A). GM bulletin PIT5677, later 21-NA-149, names P2B34 among the codes a damaged engine harness can produce when it rubs through on the camshaft carrier or near the left shock tower; fuses may blow as well. The cam sleeve then cannot be shifted, so the engine runs without lift change or cylinder deactivation. The open circuit has its own code, P2B33.
- What you may notice
- MIL on, often together with other codes from the same harness section
- Lift switching and cylinder deactivation unavailable
- With a chafed harness also rough running, reduced power or blown fuses
- Likely causes
- LikelyEngine harness chafed through on the camshaft carrier or near the left shock tower (GM PIT5677)
- PossibleShorted turns or short to housing in actuator B
- RareOil or moisture in the actuator connector creating a path to ground
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.