Powertrain, shared range

P34B7 B Camshaft Position Actuator Temperature Sensor Circuit High Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P34B7 sets when the heat reading delivered by exhaust actuator B, bank 1, sits above its upper limit. Electrically this points to an open signal line, a detached sensor ground or contact with battery or reference voltage; with a negative-coefficient element the module would see an implausibly cold actuator. A cold reading harms nothing by itself, but it robs the controller of its heat protection – in Aisin's design the reading decides when the holding current at the end stop must be cut back – so the module will typically stop relying on electric phasing. NTN-SNR describes P34B7 as an excessive outlet-side signal. No manufacturer text on this code is published. CARB obliges the OBD system to recognise such open or shorted circuits. Low counterpart: P34B6.

Likely causes

Signal line or sensor ground interrupted, plug corroded
Signal line shorted to a supply wire
Sensor element open inside the actuator

Symptoms

  • Malfunction indicator lamp lit
  • Exhaust cam on bank 1 held in its default position

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–800
Time0.5–3 h

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

Parts involved

cam actuator b temp sensor b1sensor wiring

Related codes

P34B4P34B5P34B6P34BBP34A7

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