OBD-II Diagnostic Trouble Code
P2032 — Exhaust Gas Temperature Sensor Bank 1 Sensor 2 Low
P2032 means the signal from exhaust gas temperature sensor bank 1 sensor 2 is below the expected voltage range. On most systems this low voltage corresponds to an impossible temperature reading and usually points to a signal circuit shorted to ground or a shorted sensor. On diesels sensor 2 is typically between the DOC and DPF, though location can vary by OEM.
Severity 3/5
Truck-relevant
Service this week
Severity
Service this week
Exhaust Gas Temperature Sensor Bank 1 Sensor 2 Low
Code
P2032
Category
Powertrain
Subsystem
Aftertreatment
Truck-relevant
Yes
What this means for truckers
Service within a few days on a Cummins X15, Detroit DD15, PACCAR MX-13. Performance is likely degraded. Continuing to drive without service risks additional component damage.
Before you replace parts — try this first
P2032 on the Aftertreatment system is most often signal wire shorted to ground where the harness rubs on the frame or exhaust bracket — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Check-engine light and usually disabled or interrupted active DPF regeneration, since the ECM cannot confirm DPF inlet temperature. Soot load can build up, leading to regen-needed warnings, parked regen requests and, if left long enough, an emissions derate. The truck usually drives normally at first.
Common causes
- CommonSignal wire shorted to ground where the harness rubs on the frame or exhaust bracket ($100–$400)
- CommonInternally shorted EGT sensor ($150–$450)
- OccasionalWater intrusion in the connector causing a leak path to ground ($80–$250)
- RareFaulty EGT module or ECM input ($500–$2500)
How to fix
Unplug the sensor and watch the reading: if it changes to an open-circuit value, the short is in the sensor
When to use: Quick test to separate a shorted sensor from shorted wiring
Check the signal wire for continuity to ground with the sensor and ECM/module disconnected
When to use: When the reading stays low with the sensor unplugged
Dry, clean and reseal the connector with dielectric grease
When to use: When corrosion or moisture is found at the connector
Replace the sensor and route the pigtail properly with heat protection
When to use: When the sensor resistance is far below specification
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → P2002 — Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
- → P2003 — Diesel Particulate Filter Efficiency Below Threshold (Bank 2)
- → P2031 — Exhaust Gas Temperature Sensor Bank 1 Sensor 2
- → P2033 — Exhaust Gas Temperature Sensor Bank 1 Sensor 2 High
- → P2080 — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1
Frequently Asked Questions
Can I drive with code P2032?
P2032 is severity 3 — plan service within a few days. Performance is likely degraded already (you may feel reduced power, harsher shifts, or slightly worse fuel economy). Continuing to drive risks additional damage to adjacent components.
How much does it cost to fix P2032 on a commercial truck?
Total repair cost ranges $80–$2500 depending on the root cause. The cheapest fix is usually the first one listed below — Signal wire shorted to ground where the harness rubs on the frame or exhaust bracket — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will P2032 fail a DOT inspection?
Yes — P2032 is an emissions-related code, and DOT inspectors check emissions compliance. An active emissions code with a check engine light can result in an out-of-service violation under FMCSA Part 393. The truck typically can't be moved until the code is cleared. Repeated emissions violations escalate to CSA scores.
What's the difference between P2032 and related codes?
P2032 is closely related to: P2002 (Diesel Particulate Filter Efficiency Below Threshold (Bank 1)), P2003 (Diesel Particulate Filter Efficiency Below Threshold (Bank 2)), P2031 (Exhaust Gas Temperature Sensor Bank 1 Sensor 2), P2033 (Exhaust Gas Temperature Sensor Bank 1 Sensor 2 High). These codes share the same subsystem (aftertreatment) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only P2032 is set without the companions, the issue is more isolated.
How do I prevent P2032 from coming back after a repair?
For P2032 (Exhaust Gas Temperature Sensor Bank 1 Sensor 2 Low), prevention centers on the aftertreatment system. Run quality DEF (verify supplier — BlueDEF, PEAK, Yara Air1). Don't skip parked regens — when the dash asks for one, do it. Avoid extended idle time which fouls the DPF. Replace NOx sensors at the OEM interval (typically 400K miles).