P1400: Aftermarket Calibration Detected (Chrysler, Dodge, Ram)
Key takeaways
- On Dodge and Ram vehicles, P1400 means the engine computer detected software that doesn't match a factory calibration and flags that warranty coverage needs to be confirmed.
- It isn't a mechanical fault, and the car usually drives normally; it's safe to drive while you sort it out.
- A Ram bulletin covers P1400 setting falsely on 2019–2023 Ram 2500, 3500 and 4500 trucks, and Dodge bulletins cover it on 2014–2021 Challenger and Charger; ask the dealer before assuming a tune.
- If the car really has been tuned, returning it to the stock calibration is the fix, and a dealer may question warranty claims on the engine and transmission.
- P1400 is manufacturer-specific; on other makes it can mean something else, such as an EGR sensor circuit, so check your make's definition.
What P1400 means
On a Dodge or Ram, your engine computer thinks its software has been changed. The bulletins call it “Aftermarket Calibration Detected/Warranty Coverage Confirmation Required.” The engine computer checks its own calibration against what the factory installed. When a tuner or other non-factory software has been loaded, or when the check misfires, it stores P1400 and turns on the check engine light.
P1400 is a manufacturer-specific code, and what it means depends on the make. Every bulletin in our NHTSA data that names it is from Dodge or Ram. On some other makes, P1400 has been used for an EGR system code, often the EGR pressure sensor circuit, so if you don’t drive a Dodge, Ram or Chrysler, look up your make’s definition before acting on this page.
Is it safe to drive?
Yes, on a Dodge or Ram where the car drives normally. The code flags software, not a failing part. The only real risk is on the warranty side, if the car has actually been tuned.
The answer changes if the car also runs poorly, stalls, or has other codes stored. Then P1400 is not the main story; diagnose the other codes first. On other makes, where P1400 may point at the EGR system, expect a check engine light and possibly a failed emissions test rather than a safety problem.
Causes, ranked
| Cause | How you confirm it | Typical cost (US independent shop, 2026) |
|---|---|---|
| Code setting falsely on a factory-calibrated vehicle (Dodge, Ram) | A bulletin covers your model and year; no tuner has been used | $0–$200 (software update, often covered) |
| Aftermarket tune loaded on the engine computer | Tuner history, a handheld programmer, or a calibration ID that doesn’t match factory | $0 if you reload the stock file yourself; $100–$200 for a dealer reflash |
| Interrupted or mismatched software update | Code appeared right after programming or a module replacement | $100–$200 |
| On other makes: EGR pressure sensor or its circuit | Make-specific definition confirms an EGR code; sensor reading or wiring test fails | $100–$300 |
| On other makes: EGR sensor wiring or hoses | Cracked or loose sensor hoses, damaged connector | $100–$250 |
What to check first
- Confirm the definition for your make. A scanner that shows manufacturer definitions will say “Aftermarket Calibration Detected” on Dodge and Ram. If it says something else, follow that.
- Ask whether the car has ever been tuned, especially if you bought it used. A tuner or plug-in programmer is the obvious cause.
- If it’s tuned, return it to stock with the tuner’s saved factory file, or have a dealer reflash it.
- If it was never tuned, ask the dealer about the bulletin. The pattern is narrow but clear: a Ram bulletin covers P1400 setting falsely on 2019–2023 Ram 2500, 3500 and 4500 trucks, and two Dodge bulletins cover the engine computer setting it on 2014–2021 Challenger and Charger.
- Don’t replace parts for this code on a Dodge or Ram. There’s nothing mechanical to fix.
2 owner complaints filed with NHTSA mention P1400, one on a 2020 Ram 4500 and one on a 2007 Subaru Forester. That’s too few to show a pattern; they’re owner reports, not confirmed defects.
What it costs
The cheap outcome is $0: a bulletin software update done under warranty, or you reloading your stock file. The common outcome is a dealer reflash at $100–$200. On other makes where P1400 is an EGR sensor code, the expensive outcome is an EGR pressure sensor at $100–$300. See check engine light on but car runs fine for how to decide how quickly to deal with a code like this.
Related codes
P1404, P1406 and P1409 sit next to P1400 in the manufacturer-specific range and are used for EGR system faults on several makes, which is why P1400 often gets mistaken for one. If your car has a real EGR problem, the generic codes P0401 (insufficient EGR flow) and P0405 (EGR sensor circuit low) are the ones to look at.
What owners report to NHTSA
2 complaints filed with NHTSA mention P1400, 2 of them since 2015, across 2 different models. The component owners most often filed it under: electrical system.
Manufacturer service bulletins that name P1400
3 technical service bulletins and manufacturer communications filed with NHTSA mention P1400, from 2 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- RAM 2500 (2019, 2020, 2021, 2022), bulletin 10231739: Diagnostic Trouble Code (DTC) P1400 ? Aftermarket Calibration Detected/Warranty Coverage Confirmation Required, Setting Falsely.
- DODGE CHALLENGER (2016, 2017, 2018, 2019), bulletin 10190619: PCM Sets DTC P1400-Aftermarket Calibration Detected/Warranty Coverage Confirmation Required
Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.
Frequently asked questions
What does P1400 mean on a Dodge or Ram?
Aftermarket Calibration Detected/Warranty Coverage Confirmation Required. The engine computer found software it doesn't recognize as a factory calibration, usually from a tuner. A Ram bulletin also covers it setting falsely on untuned trucks.
Will P1400 void my warranty?
The code itself doesn't void anything, but it tells the dealer to confirm coverage. If the car was tuned, expect questions on engine and transmission claims. If it was never tuned, ask the dealer about the bulletin for a false P1400; that's a software fix.
My truck was never tuned. Why do I have P1400?
It can set falsely. A Ram bulletin covers exactly that on 2019–2023 Ram 2500, 3500 and 4500 trucks, and Dodge has bulletins on the code for 2014–2021 Challenger and Charger. Ask a dealer to check the bulletin for your VIN; a software fix is the usual outcome.
Does P1400 mean the same thing on every car?
No. It's manufacturer-specific. Our bulletin data only covers Dodge and Ram, where it means an aftermarket calibration was detected. On some other makes P1400 is used for an EGR or EGR pressure sensor circuit, so look up your make's definition before buying parts.