Auxiliary Temperature Sensor 2 Circuit - Voltage Above Normal
The CUMMINS-297 (Cummins) diesel fault code means: Auxiliary Temperature Sensor 2 Circuit - Voltage Above Normal. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $150-$450
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View pilot availability →What Are the Symptoms of CUMMINS-297?
- Check Engine Light illuminated
- Sensor-related gauge reads zero or max
- Possible engine derate
- Fault code active on scan tool
- May affect cold start performance
What Causes CUMMINS-297? (Most Likely First)
- Failed sensor element Very Likely
- Open or shorted wiring to sensor Likely
- Corroded or backed-out connector pin Likely
- 5V reference supply out of spec Possible
- ECM input circuit fault Less Likely
Can I Still Drive with CUMMINS-297?
Yes, but fix soon. CUMMINS-297 is rated low severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring it.
Frequently Asked Questions
What is Cummins fault code 297?
Cummins fault code 297 indicates: Auxiliary Temperature Sensor 2 Circuit - Voltage Above Normal. It is a low-severity fault affecting a specific engine or aftertreatment sensor.
Can I drive with Cummins fault code 297?
Yes, short-term driving is typically safe with fault 297, but the fault will illuminate the Check Engine Light and must be diagnosed soon. Monitor for power loss, unusual noises, or gauge changes and pull over if conditions worsen.
How much does it cost to fix Cummins fault 297?
Repair cost is approximately $150-$450 including parts, labor, and any dealer programming required. DIY repairs (sensor replacement) fall at the low end; pump, aftertreatment, or ECM work falls at the high end and usually requires INSITE diagnostic software.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose CUMMINS-297?
Connect INSITE and monitor the sensor live data associated with SPN 442 -- compare against known-good spec.
Unplug sensor connector and inspect for bent, corroded, or backed-out pins. Check for moisture intrusion.
Measure 5V reference at signal return line (should be 4.9-5.1V key-on with sensor unplugged).
Measure sensor resistance across signal and return pins per Cummins service manual spec.
Backprobe harness and wiggle-test while watching live data for intermittent faults.
If sensor tests in-spec, inspect harness between sensor and ECM for chafing or pinches.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
Which Vehicles Commonly Get CUMMINS-297?
- Peterbilt 579, 567 with Cummins ISX/X15
- Kenworth T680, T880 with Cummins X15
- Ram 2500/3500 with 6.7L Cummins
- Ram 4500/5500 with 6.7L Cummins
- Freightliner M2 106 with Cummins ISL9/L9
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