P0237

Code

LAND ROVER P — Powertrain

Turbocharger Boost Sensor A - Low Circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 26 EN: 57 RU: 93

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Page language: EN

Causes

Open or shorted signal wiring between boost sensor and ECM (short to ground)
Poor or corroded connector at the boost sensor
Failed boost pressure (MAP) sensor
Missing or low reference voltage (5V) or poor sensor ground
Intermittent harness damage (chafing, pinched wires)
ECM internal fault (rare)

Symptoms

Check Engine Light (MIL) illuminated
Reduced engine power or limp-in mode
Poor acceleration and turbo response
Excessive smoke or rough running under load
Possible diagnostic trouble codes related to MAP/boost or turbo control

What to check

Read freeze frame and live data for boost pressure and sensor voltage with a scan tool
Compare boost sensor voltage to expected values at key ON/engine off, idle, and under boost
Inspect sensor connector and wiring for corrosion, damage or loose pins
Backprobe sensor: verify reference voltage (typically 5V) and good ground
Check continuity of signal wire to ECM and for shorts to ground or battery
Perform a wiggle test on wiring while monitoring live data for intermittent faults

Signal parameters

Reference supply: ≈5 V (key ON) to sensor (verify OEM spec)
Expected signal output: generally ≈0.5–4.5 V (low at low/negative manifold pressure, higher with boost) — check vehicle-specific chart
Typical pressure range: sensor measures atmospheric to boost (e.g., ~20–250 kPa absolute or -1 to +2 bar gauge) — verify Land Rover spec
ECM detects fault when signal is below manufacturer-defined threshold or out-of-range for measured conditions

Diagnostic algorithm

Retrieve freeze-frame, pending/confirmed codes and review live MAP/boost sensor voltage and calculated pressure.
With ignition ON (engine OFF), backprobe connector: confirm sensor reference voltage (≈5V) and ground presence. If missing, trace harness to fuse and ECM.
Measure sensor output voltage with key ON and while engine is running at idle and under load (road or dyno). Compare to expected values. If voltage is stuck low, suspect wiring or sensor.
Inspect connector and wiring for corrosion, damage, or water ingress. Repair/clean connector and retest.
Check continuity from sensor signal pin to ECM pin and check resistance to ground to detect shorts. Repair any open/shorted wires.
If wiring and connectors are good, substitute known-good sensor or bench-test replacement sensor per OEM procedure.
If sensor replacement does not clear the fault, consider ECM input circuit testing or module replacement following manufacturer guidance.
Verify turbo boost system integrity (intercooler, hoses, clamps, wastegate actuator) to rule out mechanical causes of low boost. Repair as needed.
Clear codes and perform road test to confirm the fault does not return and that boost behavior is normal.

Likely causes

Broken/shorted signal wire to ECM
Corroded/loose sensor connector pins
Failed boost pressure sensor
Sensor reference (5V) or ground open/weak
Damaged harness near turbo/intake
Large intake/boost leak or wastegate problem producing low pressure

Fault status

⚠️ Status

Stored code P0237 — Turbocharger Boost Sensor A: Low Circuit. ECM reports sensor signal below expected range; vehicle may reduce engine output.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

Repair manuals

Manual library for LAND ROVER

413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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P0237 — Turbocharger Boost Sensor A - Low Circuit