P24C2: Exhaust Gas Temperature Measurement System Multiple Sensor Correlation Bank 1
The multiple EGT sensors on bank 1 disagree by more than the diagnostic tolerance under stable conditions - one of them has drifted relative to the others.
What P24C2 means
P24C2 is a generic OBD-II powertrain code in the emissions group. Bank 1 is the side of the engine with cylinder 1 (inline engines only have bank 1).
- Check engine light
- Usually on
- Emissions-related
- Yes — can fail inspection
- Limp mode possible
- Not typical
- Drive cycle to clear
- Not required
Get it fixed
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Common causes
- 01One sensor has driftedMost likely
Can I drive with P24C2?
Usually yes, for a short time.
The car will often drive normally, but get it diagnosed soon. Left alone it can raise fuel use and emissions and will fail an OBD inspection. If you notice rough running, warning lights flashing, overheating or a burning smell, stop driving.
Why we rate it moderate
- Turns on the check engine light
- Emissions-related: will usually fail an OBD inspection
Severity is our rule-based rating from the code’s flags in OBDex and the system it affects, not an inspection of your car. If the check engine light is flashing, or you notice overheating, low oil pressure, or brake or steering problems, stop driving and get help.
How to diagnose P24C2
- 1
Confirm the code and save freeze-frame data
Read the codes with an OBD-II scan tool and note every code, not just P24C2. Save the freeze-frame data (speed, load, temperature when the fault set) before clearing anything; it tells you when the fault happens.
- 2
Check for related codes first
Look for P24C3. Related codes often share a cause; a circuit or sensor code usually needs fixing before a performance code like this one.
- 3
Check live data
Watch the related sensor and actuator readings in live data (EGT sensor (Bank 1, sensor 1), EGT sensor (Bank 1, sensor 2), EGT sensor (Bank 1, sensor 3)) and compare them with expected values in the service information for your vehicle.
- 4
Test the likely causes in order
Start with the most likely cause and work down: One sensor has drifted. Test before replacing parts.
- 5
Check for recalls and service bulletins
Look up recalls for your exact vehicle with its VIN, and ask a dealer about technical service bulletins (TSBs). Manufacturers sometimes issue software updates or extended warranties for known faults.
- 6
Clear the code and verify the repair
After the repair, clear the code and drive the car under the conditions in the freeze-frame data to confirm it does not return.
P24C2 repair cost estimate
Estimate, not a quote. Labor times are typical ranges for this code from OBDex, and $125/hr is an assumed rate. Shop rates and labor times vary by vehicle and region. Diagnosis time may be billed separately.
- DIY difficulty
- Moderate
- Good DIY job?
- Yes, with a scan tool
Needs a scan tool and some experience with testing.
Parts and systems involved
- EGT sensor (Bank 1, sensor 1)
- EGT sensor (Bank 1, sensor 2)
- EGT sensor (Bank 1, sensor 3)
- EGT sensor (Bank 1, sensor 4)
P24C2 FAQ
What does P24C2 mean?
P24C2 means “Exhaust Gas Temperature Measurement System Multiple Sensor Correlation Bank 1”. The multiple EGT sensors on bank 1 disagree by more than the diagnostic tolerance under stable conditions - one of them has drifted relative to the others.
Is P24C2 serious? Can I keep driving?
We rate P24C2 as moderate severity. Usually yes, for a short time. The car will often drive normally, but get it diagnosed soon. Left alone it can raise fuel use and emissions and will fail an OBD inspection. If you notice rough running, warning lights flashing, overheating or a burning smell, stop driving.
What causes P24C2?
The most common causes, from most to least likely: One sensor has drifted. Test before replacing parts, because several causes can set the same code.
How much does it cost to fix P24C2?
Typical labor is about $125–$375 at an assumed $125/hour shop rate, plus parts. That is an estimate, not a quote: labor times and rates vary by vehicle and region, and diagnosis may be billed separately.
Can I fix P24C2 myself?
DIY difficulty is moderate. Many owners can handle it with a scan tool, a multimeter and basic hand tools. Always confirm the cause before buying parts.
Will P24C2 clear itself?
If the fault was intermittent, the warning may go off once the computer stops seeing it, but the code stays in memory. Fix the cause; clearing the code alone doesn’t repair anything.