Code
P132C
LAND ROVER
P — Powertrain
Turbo / supercharger control A voltage
Views:
UK: 7
EN: 16
RU: 8
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the turbo/supercharger control A circuit
- Corroded, loose or damaged connector at actuator or ECU
- Failed turbo/supercharger actuator, solenoid valve or bypass valve
- Blown fuse or faulty relay supplying actuator power/ground
- Intermittent connection or contamination (oil/water) in connector
- ECU internal driver fault or software anomaly
Symptoms
- MIL/Check Engine Light illuminated
- Reduced engine power or limp-home mode
- Poor or inconsistent boost, delayed spool or turbo surge
- Hesitation, loss of acceleration or reduced top-end performance
- Possible unusual turbo/supercharger noise if actuator mechanically stuck
- Degraded fuel economy
What to check
- Read and record freeze-frame and pending codes with a diagnostic scanner
- Inspect actuator/solenoid connector and wiring visually for damage, corrosion, oil contamination or heat chafe
- Check fuses and related relays for the turbo/supercharger control circuit
- Backprobe connector with key on and with actuator commanded by scanner (if bi-directional control available)
- Measure voltage supply and ground at actuator connector with multimeter
- Measure actuator resistance and compare to specification
Signal parameters
- Supply voltage: approximately battery voltage (nominal ~12–14 V) at power feed circuit when key ON
- Control signal: either low/high (0 V to battery voltage) or PWM duty control; expected 0%–100% duty when commanded by ECU
- Actuator coil/solenoid resistance: typically low ohms to tens of ohms — compare to OEM spec
- Typical PWM frequency (if used): tens to a few hundred Hz (refer to OEM data)
- Expected behavior: voltage or duty changes when actuator is commanded ON/OFF by scan tool; no sudden spikes or open-circuit voltages
Diagnostic algorithm
- Verify code and record freeze-frame data with a scan tool. Clear codes and attempt to re-create the fault conditions. 2) Visually inspect actuator/solenoid, connector, harness and nearby vacuum/pressure hoses for damage, oil or corrosion. 3) Check fuses/relays for the turbo/supercharger control circuit; replace if blown. 4) With ignition ON (engine off) measure battery voltage at the actuator power pin and verify good ground at the connector. 5) Backprobe the control/command pin while commanding the actuator ON and OFF with a bi-directional scanner; observe voltage or PWM duty change. 6) Measure actuator/solenoid coil resistance; compare to manufacturer specification. 7) Perform continuity checks from actuator pins to ECU connector pins; repair any opens or shorts. 8) If wiring and connector are good but actuator does not respond electrically or mechanically, replace the actuator/solenoid and retest. 9) If new actuator still faults and wiring is confirmed good, consult OEM wiring diagram and consider ECU driver fault — verify with OEM diagnostics before ECU replacement. 10) After repairs, clear codes and verify correct boost control behavior on road or dyno and confirm no reoccurrence.
Likely causes
- Damaged wiring harness at common wear points (engine bay, heat exposure)
- Corroded pin or connector at actuator or ECU
- Failed control valve/solenoid (stuck or electrically open/short)
- Blown fuse or poor chassis ground
- ECU driver failure (less common)
Fault status
Status
P132C - Turbo / supercharger control A voltage: indicates the control circuit for turbo/supercharger actuator/solenoid A is outside expected voltage or signal parameters (open, short, low/high voltage or abnormal PWM). Check wiring, connector, power/ground and actuator; ECU driver fault is less common.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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