P0AB7

Code

Generic P — Powertrain

Engine Mount B Control Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 30 RU: 24

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Read and record freeze frame and pending codes with a scan tool; note operating conditions when code set
Visually inspect wiring, connectors and harness to Engine Mount B for damage, corrosion, or pin push-out
Check battery voltage (key ON and cranking) and relevant fuses/relays for the mount circuit
Back-probe the mount connector while commanding the mount ON/OFF with a scan tool and observe voltage
Measure resistance of the actuator/solenoid with connector disconnected (compare to spec)
Wiggle test wiring with engine running/command active to see if voltage changes or code returns

Supply voltage to circuit: battery voltage; should be ~12V key ON (minus small drop across fuse/relay)
Control/drive signal: typically a switched battery or PWM output from PCM — expected to switch between near 0V and battery voltage when commanded
Coil/actuator resistance: measured with connector disconnected; consult vehicle service info (typical solenoid coils often in low ohm range — example 1–50 Ω, verify spec)
Ground continuity: near 0 Ω from actuator ground terminal to chassis/PCM ground
No-load current draw: when activated should draw within spec (excessive or no current indicates short/open)

Verify the code: connect a scan tool, confirm P0AB7, and capture freeze frame and any related codes.
Check basic power/ground: verify battery voltage and inspect/verify operation of any associated fuse(s) and relay(s). Replace if blown or faulty.
Visual inspection: inspect harness and connector at Engine Mount B for corrosion, bent pins, melted insulation, or physical damage.
Back-probe with command: with scan tool, command the mount ON/OFF while back-probing the control and supply terminals. Observe voltage change and compare to expected (0V ↔ battery voltage or PWM).
Measure actuator resistance: disconnect connector and measure coil resistance. Compare to service spec. An open/infinite or very high resistance indicates a failed actuator.
Wiggle / load test: with harness connected and mount commanded, wiggle wiring and connectors to check for intermittent faults and see if code returns.
Check grounds: verify continuity and low resistance from actuator ground to chassis/PCM ground; repair any poor ground.
If wiring and actuator test OK: check PCM output driver by observing command waveform at the PCM pin. If no drive from PCM when expected, verify PCM ground and supply and consider module fault.
Repair or replace the faulty component (connector repair, wiring repair, fuse/relay, actuator), clear codes and road test to confirm repair. If code returns after good wiring and actuator tests, consider module-level diagnosis per service manual.