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Home / DTC / P2493 — EGR Cooler Bypass Position Sensor Range/Performance Bank 1

P2493 — EGR Cooler Bypass Position Sensor Range/Performance Bank 1

Detailed page for trouble code P2493.

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Code

P2493

Generic P — Powertrain

EGR Cooler Bypass Position Sensor Range/Performance Bank 1

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 37 RU: 15
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Page language: EN

Causes

  • Failed or degraded EGR cooler bypass position sensor (potentiometer/Hall sensor)
  • Open, shorted or corroded wiring/connectors between sensor and PCM
  • Sticking, seized or mechanically damaged EGR cooler bypass valve or actuator
  • Carbon/soot contamination on sensor or valve linkage preventing smooth movement
  • Poor ground or missing reference voltage from PCM
  • Intermittent connector contact or harness chafing

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Stored P2493 fault (may be accompanied by other EGR codes)
  • Reduced engine performance, rough idle or hesitation under load
  • Higher than normal exhaust or EGR cooler temperatures
  • Decreased fuel economy or increased emissions
  • Possible limp-in/derate on some vehicles

What to check

  • Read and record freeze frame and continuous data (live PID for EGR cooler bypass position)
  • Check for other stored codes (EGR, temperature, intake) that may help pinpoint cause
  • Visual inspection of EGR cooler bypass valve, actuator and harness for damage, soot build-up, disconnection or corrosion
  • Backprobe sensor connector and observe live voltage/PID while commanding bypass valve with a scan tool
  • Measure reference voltage and ground at sensor connector (typically 5V reference and ground)
  • Perform wiggle test on wiring and connector while monitoring sensor signal for intermittent faults

Signal parameters

  • Typical sensor output (generic): ~0.5–4.5 V across travel (varies by manufacturer)
  • Reference voltage: ~5 V (key ON) to sensor (vehicle-specific)
  • Signal should change smoothly and monotonically as valve moves; no sudden jumps or dropout
  • Response time: signal should follow commanded movement within
  • Resistance between sensor signal and ground typically measurable but manufacturer-specific (consult OEM)

Diagnostic algorithm

  1. Verify DTC and capture freeze frame + live data. Note sensor PID value at key ON engine OFF and at idle.
  2. Check for related DTCs (P2494, P0401, P0402, P0403) to narrow focus.
  3. Perform a visual inspection of the sensor, bypass valve, actuator and wiring harness for damage, contamination or loose connectors.
  4. With connector accessible, backprobe signal, reference and ground pins. Verify reference voltage (≈5 V) and good ground with key ON. If reference missing, trace to PCM.
  5. Command bypass valve open/close with a scan tool while watching sensor voltage/PID. Confirm sensor output changes smoothly across its range and corresponds to commanded position.
  6. If signal does not change, disconnect sensor and measure for opens/shorts: check continuity to PCM, resistance to ground and battery to detect short-to-power/ground.
  7. Wiggle harness and connector while observing live data to find intermittent faults. Repair or replace any damaged wiring or connectors.
  8. Inspect and, if required, clean or service bypass valve and linkage. Verify free movement; replace valve or actuator if mechanically seized or binding.
  9. If wiring and valve operation are good but signal still invalid, replace the position sensor. Reconnect and recheck operation.
  10. Clear codes and perform road test to verify repair. If problem persists, consider PCM input circuit testing or replacement per OEM guidance.

Likely causes

  • Sensor failed (internal wear or contamination)
  • Wiring open or short to power/ground
  • Connector corrosion or bent terminals
  • Bypass valve mechanically bound by soot or debris
  • Connector not seated after service

Fault status

⚠️ Status
P2493 - EGR Cooler Bypass Position Sensor Range/Performance Bank 1: Sensor signal out of range or not responding correctly to bypass valve movement.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P2494 P0401 P0402 P0403
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