P2494

Code

LAND ROVER P — Powertrain

Recirculation gas cooler bypass position sensor escape - Low circuit - Bank 1

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 23 EN: 52 RU: 19

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Page language: EN

Causes

Open or short to ground in the bypass position sensor signal circuit
Damaged or corroded connector or pins at the sensor
Faulty recirculation gas cooler bypass position sensor (potentiometer/position sensor)
Faulty bypass actuator or mechanical binding preventing normal sensor output
Intermittent wiring break or chafed harness
Water ingress or corrosion at sensor/connector

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine performance or enter limp/derate mode on some vehicles
Failed emissions test or elevated NOx/soot levels
Possible rough idle, hesitation or irregular exhaust/gas temperatures
EGR-related faults or DPF/dregen anomalies reported

What to check

Read and record DTCs and freeze frame data; check for other related codes (EGR, temperature sensors, CAN/communications)
Inspect sensor connector and wiring for corrosion, damage, or water ingress
Backprobe sensor connector and observe live signal while turning bypass actuator or during commanded cycles
Verify sensor reference voltage (usually ~5V) and ground at the connector
Measure sensor signal voltage at key positions; check for low or stuck-to-ground readings
Perform wiggle test on harness while monitoring live signal to locate intermittent faults

Signal parameters

Sensor reference (typical): ~5 V reference (check vehicle spec)
Ground: continuity to chassis ground; low resistance (< a few ohms)
Signal output (typical expected range): approx. 0.1–4.9 V depending on position; low-circuit fault typically when signal < ~0.2–0.5 V
Open-circuit: very low or no change in voltage; short-to-ground: signal ≈ 0 V
When commanded, signal should move smoothly without jumps or dropout

Diagnostic algorithm

Confirm P2494 present and note freeze-frame/live data; clear code and attempt to re-run to confirm repeatability.
Visually inspect the bypass position sensor connector and wiring on Bank 1 for damage, corrosion, heat damage, or water ingress; repair any obvious damage.
With ignition on (engine off), backprobe sensor connector: verify reference voltage (≈5 V) and ground presence. If reference is missing, trace to ECM/fuse/PCM supply.
Probe the sensor signal pin while manually actuating the bypass (or commanding via scanner if available). Observe signal voltage: check for smooth proportional change. A constant very low voltage indicates low circuit/short to ground or failed sensor.
If signal is low, disconnect sensor and measure continuity between the signal wire and chassis ground to check for short to ground. Repair any shorted wiring.
Check resistance of the position sensor if service manual values available. Replace sensor if internal potentiometer or sensor fails specification.
Verify actuator moves freely. If mechanically seized or binding, repair or replace actuator/cooler assembly as required.
After repairs, clear codes and perform a test drive or monitor live data to confirm proper operation and that P2494 does not return.
If all wiring and sensor check good but fault persists, consider ECM input circuit testing or replacement as a last resort (refer to manufacturer procedures).

Likely causes

Low/zero volts on the sensor signal due to a short to ground or open reference/supply
Corroded or loose connector at bypass position sensor causing poor contact
Wiring harness damaged where it rubs or is heat-deteriorated near the EGR cooler
Failed position sensor inside bypass actuator due to wear or contamination
Bypass actuator mechanically seized, causing abnormal sensor output

Fault status

⚠️ Status

P2494 - Recirculation gas cooler bypass position sensor escape - Low circuit - Bank 1. The ECM has detected the bypass position sensor signal is below the expected threshold (likely short to ground, open reference, or failed sensor).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P2494 — Recirculation gas cooler bypass position sensor escape - Low circuit - Bank 1