Powertrain, shared range

P34BB B Camshaft Position Actuator Temperature Sensor Circuit High Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P34BB is stored when the bank 2 exhaust actuator's temperature signal stays above its window – typically a broken signal line, a loosened ground connection or contact with a supply wire. Because the module can no longer see how warm the actuator driver is, it lacks what it needs to protect it; Aisin's design, for comparison, ends its current reduction only after the reading has stayed below a return threshold for some time. With the value missing, the exhaust phaser on this bank will usually be kept in a safe position, so the warning lamp is often the only sign. No manufacturer publication covers P34BB, and NTN-SNR simply calls it too high a signal on the outlet side, second bank. High fault on bank 1: P34B7; low on bank 2: P34BA.

Likely causes

Signal line broken or sensor ground loose
Signal line touching a supply wire
Sensor open inside the bank 2 actuator

Symptoms

  • Malfunction indicator lamp lit
  • Bank 2 exhaust cam held in a safe position

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–850
Time0.5–3.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cam actuator b temp sensor b2sensor wiring

Related codes

P34B7P34B8P34B9P34BAP34AB

References: law.cornell.edu, ntn-snr.com, patents.google.com.