P251E

Code

LAND ROVER P — Powertrain

Engine shutdown - circuit high

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 10 EN: 21 RU: 12

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Page language: EN

Causes

Short to battery voltage on the shutdown/kill wiring
Damaged or corroded connector or wiring (chafing, water ingress)
Failed shutdown actuator/solenoid/relay with internal short
Faulty fuse or relay feeding the circuit
Poor or intermittent ground elsewhere in the system causing abnormal voltage reference
ECM/PCM internal fault or damaged input driver

Symptoms

Malfunction Indicator Lamp (MIL) or warning lamp illuminated
Engine will not start or shuts down unexpectedly
Intermittent or no-crank / no-start condition
Possible loss of fuel/ignition control when ECM detects the fault
Codes may return after clearing or appear intermittently

What to check

Read and save freeze-frame and full scan tool data; record freeze-frame conditions (ignition state, battery voltage, engine status)
Check for additional stored codes or manufacturer-specific network messages
Visually inspect wiring harness, connectors, and protective loom along routing to shutdown solenoid/relay and ECM
Check fuses and relays related to engine shutdown and ECM power circuits
Look for signs of water, corrosion, heat damage, or repair/interference from aftermarket devices

Signal parameters

Expected behavior: circuit should switch between low (grounded/active) and battery voltage (inactive). Typical reference: ~0–0.5 V when pulled low, near battery voltage (≈11–14 V) when open/high
Fault symptom: measured voltage remains continuously high (near battery) or exceeds expected range for the input
Compare live data for circuit state with ignition and crank positions; note any unexpected high readings during conditions that should be low

Diagnostic algorithm

Connect an OEM-capable scan tool, read live data and freeze-frame, then clear codes and attempt to re-create the fault
Perform a careful visual inspection of wiring and connectors between ECM and shutdown actuator/relay; repair any obvious damage
With ignition ON (but engine off), backprobe the shutdown circuit connector and measure voltage. Verify voltage vs. expected active/inactive states
Wiggle tests: with backprobe connected, gently move harness and connectors while observing voltage to find intermittent shorts/open circuits
Disconnect the shutdown actuator/relay and check if the fault clears or voltage changes. If disconnecting removes the high voltage, suspect short/actuator
Check and swap related fuses/relays or substitute a known-good relay if suspected
Perform continuity checks from control pin to ECM and to the actuator/relay; check for unintended continuity to battery positive
Verify proper ground(s) in the circuit and battery voltage health; test for parasitic feeds from aftermarket devices
If wiring, connector, and component checks are good and the circuit still reads high, consider ECM input driver failure and consult manufacturer guidance before replacing ECM
After repairs, clear codes and road/test to confirm repair and ensure code does not return

Likely causes

Wiring shorted to constant 12 V (pinch, chafe, connector contact)
Corroded connector at the shutdown solenoid/relay
Faulty shutdown actuator or relay stuck closed internally
Blown or incorrect fuse/relay allowing erroneous voltage on the circuit

Fault status

⚠️ Status

Engine shutdown circuit voltage higher than expected; ECM detected a circuit high on the shutdown/kill input.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P251E — Engine shutdown - circuit high