Diesel Trouble Codes

P2032 — Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 2 — L5P Duramax

P2032 on L5P Duramax indicates the bank 1 sensor 2 exhaust gas temperature sensor signal voltage is below its valid range. On this platform the fault is…

Updated October 15, 2026

What it means

Generic definition: The bank 1 sensor 2 exhaust gas temperature sensor signal voltage is below its valid range. Platform note: On the L5P this is usually a shorted EGT sensor or a signal wire shorted to ground.1

Most likely causes

  1. Shorted exhaust gas temperature sensor (bank 1 sensor 2) causing low signal voltage — A failed EGT sensor can pull the signal low, matching the typical L5P failure mode for P2032.1
  2. Signal wire shorted to ground between ECM and bank 1 sensor 2 EGT sensor — Chafed or melted harness in the hot exhaust area can short the EGT signal to ground, producing a low-voltage reading.1
  3. Corroded or loose EGT sensor connector at bank 1 sensor 2 — Moisture or heat damage at the connector increases resistance or creates a ground path, leading to a low circuit reading.1
  4. ECM internal fault interpreting EGT circuit low — Rarely the ECM input driver for the EGT circuit fails low; verify wiring first before condemning the ECM.1

How to diagnose

  1. Verify code P2032 is present and check freeze frame for engine temperature and DPF regen status.
  2. Inspect bank 1 sensor 2 EGT sensor connector for corrosion, moisture, or heat damage; repair as needed.
  3. Visually inspect EGT wiring harness from sensor to ECM for chafing, melting, or contact with exhaust components; repair any damage.
  4. Measure EGT sensor signal voltage at the sensor connector with key on engine off; compare to expected bias voltage and check for a short to ground.
  5. Disconnect the EGT sensor and measure sensor resistance/impedance; a shorted sensor will read near zero ohms.
  6. If sensor and wiring test normal, back-probe the ECM EGT input and check for short to ground on the signal wire with sensor disconnected.
  7. Clear codes, perform a controlled drive cycle including a DPF regeneration window, and confirm P2032 does not return.

Parts and tools you may need

Tools you’ll need

Rough cost and difficulty

Likely repairPartsShop laborWho usually does it
Wiring or connector repair$10–$1001–4 hrsDIY with tools and a manual
Exhaust gas temperature sensor$50–$2500.5–1.5 hrsDIY with tools and a manual
ECM/PCM replacement (programmed)$600–$2,0001–3 hrsShop

Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.

When to see a pro

If wiring tests normal but the code returns, or if ECM input is suspect, have a qualified diesel technician perform ECM signal verification and replacement. Do not attempt high-pressure fuel or exhaust system repairs without proper training and safety equipment.

Check for recalls

Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.

Sources

  1. Curated DTC seed — L5P Duramax (curated) ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

Repair videos: P2032 on the L5P Duramax

Third-party videos, not ours — picked for this engine. Confirm anything against the factory service information for your truck.

Duramax P2033, P2032 Diagnostics and Repair. (Resistance specs and voltage specs in description) — Screamin' Diesel Ltd · 38K views