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Diagnostic trouble code

P1DD2

7 owner reports and 12 manufacturer filings across 6 model years from Chrysler, Jeep.

PowertrainManufacturer-specific12 manufacturer filings7 owner reports

Where P1DD2 shows up

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2018 Jeep CompassElectrical System55
2017 Jeep RenegadeElectrical System5—
2018 Chrysler 300Service Brakes—1
2020 Jeep CompassPower Train1—
2019 Jeep CompassPower Train1—
2018 Jeep RenegadePower Train—1

A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.

What it gets filed under

Electrical System 7Power Train 6Exterior Lighting 3Service Brakes 1
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What owners said

Source: NHTSA complaint database

Owners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.

Outragious oil consumption, car shuts down or slows down significantly while driving, check engine light came on and now reads code P1DD2, ive only had this vehicle for 1.5 yrs
2018 Jeep CompassSep 19, 2022NHTSA owner report
OBD code was U0402 (implausible data received from TCM) and (P1DD2 torque request signal from TCM denied)
2018 Jeep Renegadeat 7,000 milesJan 7, 2020NHTSA owner report
Lastly, vehicle threw 3 codes for transmission sensors as well as EGR (U0402, u0402pd, and P1DD2) while casually driving
2018 Chrysler 300at 24,000 milesApr 26, 2019NHTSA owner report

Manufacturer filings that name it

Source: NHTSA manufacturer communications

Service bulletins and campaigns whose filed summary names P1DD2. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.

What P1DD2 means

Source: SAE J2012 / OBD-II

P1DD2 is a manufacturer-specific code: the second character is a 1, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.

A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.

Common questions about P1DD2

Source: NHTSA files and the OBD-II standard

Why does this page not define P1DD2?

Because it cannot be defined honestly. The second character of a trouble code says who owns its meaning, and a 1 or a 3 hands that to the manufacturer. Sites that print one definition for a manufacturer-specific code are showing you one automaker's meaning and hoping it is yours.

Can I keep driving with P1DD2 stored?

Nobody can answer that from the code alone, and a site that does is guessing. A steady light generally means the fault was logged and the vehicle is in a reduced-risk mode; a flashing light means stop soon, because a misfiring engine can destroy a catalytic converter in minutes. The safe read of this page is the mileage and the components, not permission.

Does a code mean the car is recalled?

No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.

Why do the counts here differ from other sites?

Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.

Will clearing the code fix it?

Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.