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Home / DTC / P2034 — Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 2

P2034 — Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 2

Detailed page for trouble code P2034.

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P2034

Generic P — Powertrain

Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 2

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 25 RU: 20
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Page language: EN

Causes

  • Open or short in EGT sensor wiring (Bank 2, Sensor 2)
  • Corroded or loose connector at the sensor
  • Failed EGT sensor (thermocouple or integrated sensor/heater)
  • Heater element open or shorted
  • Excessive soot/contamination on sensor
  • Exhaust damage or leaks affecting sensor

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Stored P2034 (and possibly related EGT codes)
  • Reduced engine performance or limp mode on some vehicles
  • Elevated emissions or failed emissions test
  • Decreased fuel economy (indirectly)
  • Poor regeneration control on DPF-equipped diesel vehicles

What to check

  • Scan for stored and pending codes; note freeze-frame and live data for EGT sensors
  • Visual inspection of wiring harness and connector for Bank 2 Sensor 2 for heat damage, corrosion, or breaks
  • Backprobe the sensor connector and check signal voltage/millivolt output while cold and during warm-up
  • Measure sensor heater resistance and supply voltage (if equipped)
  • Perform continuity and short-to-ground/short-to-voltage checks on related wires
  • Wiggle test wiring while observing live data to find intermittent faults

Signal parameters

  • Thermocouple-type EGT (typical): low mV at ambient up to several tens of mV at high temperature (rough guideline 0–50 mV depending on sensor and temp)
  • Open-circuit condition: sensor voltage stuck near 0 mV or no change with temperature
  • Short-to-ground: voltage near 0 V and low resistance to chassis ground
  • Short-to-voltage: voltage stuck near sensor supply (if applicable) or higher-than-expected mV
  • Heater circuit (if present): typical resistance often in the low ohm range (manufacturer-specific; common range ~1–30 Ω). Open heater = infinite Ω

Diagnostic algorithm

  1. Read and record all codes and live data. Note freeze-frame conditions and whether other EGT or emission-related codes are present.
  2. Perform a visual inspection of Bank 2 Sensor 2 wiring, connector, and sensor for heat damage, chafing, corrosion, soot, or physical damage. Repair any obvious damage before further testing.
  3. With ignition off, disconnect the sensor connector and inspect terminals for corrosion, bent pins, or water ingress. Repair or replace connector as needed.
  4. Check continuity: measure resistance between the sensor connector terminals and the ECM connector pins for the same circuit. Expect continuity; an open indicates a broken wire. Check for shorts to ground or to battery voltage.
  5. Measure sensor heater resistance (if equipped) at the disconnected sensor. Compare to manufacturer specification. An open or out-of-spec heater requires sensor replacement.
  6. With a sensitive multimeter, backprobe the signal lead and monitor voltage/millivolt while warming the engine (or during a controlled warm-up). Verify the signal changes as exhaust temperature rises. No change, stuck low/high, or erratic readings indicate sensor or wiring fault.
  7. Perform wiggle/stress test on harness while observing live data to detect intermittent faults. Repair harness routing or secure connectors as needed.
  8. If wiring, connectors, and sensor test good, swap with a known-good sensor (if available and applicable) or bench-test the sensor per manufacturer procedures. Replace sensor if it fails tests.
  9. After repairs, clear codes and perform a road/drive cycle to confirm the code does not return and that EGT readings behave normally.
  10. If issue persists and all external checks are good, inspect/verify ECM operation and pin voltages; consider ECM diagnosis or replacement as a last resort.

Likely causes

  • Damaged harness (chafing, rodent damage, heat degradation) to Bank 2 Sensor 2
  • Connector corrosion or bent terminals at sensor
  • Sensor failed from thermal/soot exposure
  • Heater circuit open/shorted in EGT sensor
  • Aftermarket exhaust or repair disturbed the sensor wiring

Fault status

⚠️ Status
ECM detected an abnormal condition in the Exhaust Gas Temperature Sensor Circuit — Bank 2, Sensor 2 (open/short/high/low signal or heater fault). Fault stored and MIL may be set.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P2031 P2033 P2035 P2036 P2037
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