P34BB

Code

Generic P — Powertrain

B Camshaft Position Actuator Temperature Sensor Circuit High Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 34 RU: 24

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted sensor signal wire (short to battery positive)
Corroded, loose, or damaged connector at the camshaft actuator or sensor
Failed camshaft position actuator temperature sensor (thermistor or sender)
Internal actuator failure causing abnormal temperature reading
Poor ground or supply voltage problems to the sensor circuit
PCM/ECU internal fault or corrupted software

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine performance or limp mode in some vehicles
Poor idle quality or rough running if cam phasing is affected
Reduced fuel economy
Stored camshaft timing or actuator-related DTCs
Possible crank/no-start if combined with other faults (rare)

What to check

Retrieve freeze-frame and live data for cam actuator temperature and related channels
Visually inspect wiring and connector at bank 2 camshaft actuator for damage, corrosion, or water
Backprobe sensor connector and check signal voltage with ignition ON and engine running (if safe)
Measure continuity and resistance of sensor wiring to the PCM; check for shorts to 12V and ground
Compare the actuator temperature sensor reading on Bank 1 (if present) to Bank 2
Check supply voltage and ground reference at the sensor connector

Signal parameters

Typical sensor signal range: approximately 0.1–5.0 V (varies by manufacturer)
High/erroneous condition often corresponds to signal > ~4.5 V or open circuit (pull-up to battery)
Some sensors are NTC thermistors — expect decreased resistance as temperature increases (spec varies)
Supply voltage (if present) should be close to battery voltage (approx. 12 V) with ignition ON
Ground should be near 0 V with very low resistance to chassis ground

Diagnostic algorithm

Read and record stored codes and freeze-frame data. Note engine conditions when fault set.
Clear codes and attempt to reproduce. Monitor live data for the cam actuator temperature sensor on Bank 2.
Perform visual inspection of harness and connector at the Bank 2 cam actuator. Repair obvious damage.
With connector accessible, backprobe the sensor: verify reference/supply, signal, and ground voltages per manufacturer specs.
Check continuity from the sensor connector pins to the PCM connector; look for opens, shorts to battery, and shorts to ground.
If sensor is a thermistor, measure sensor resistance at ambient and compare to expected resistance chart (or compare to Bank 1 sensor if identical).
Wiggle harness while monitoring live data to identify intermittent wiring faults.
If wiring and connector are good but signal remains high, replace the camshaft position actuator temperature sensor (or actuator assembly if sensor integrated).
If replacement does not resolve, test or swap PCM (only after verifying all wiring and sensors) or consult manufacturer technical service for known issues/calibrations.
After repair, clear codes and road-test to ensure system returns to normal and code does not recur.

Likely causes

Damaged or pinched wiring to the actuator temperature sensor
Failed temperature sensor on camshaft position actuator B (Bank 2)
Corroded connector at the actuator causing intermittent/high reading
Short to battery voltage on the sensor signal circuit
Faulty PCM (less common)

Fault status

⚠️ Status

Camshaft position actuator B temperature sensor circuit reports high signal/temperature for Bank 2. Requires inspection of sensor, wiring, connector, and related cam actuator components.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours