U0202: Lost Communication With Door Control Module D
What to do
The car drives normally; one door's electrics will have stopped responding.
The single most useful thing to establish, and it takes one scan: is more than one door affected? If two or more are silent, the problem is almost certainly something they share — a fuse, an earth, or the body control module — rather than two doors failing at once. That is a much smaller and cheaper investigation than stripping door cards.
If your vehicle has a powered sliding door, mention it. Its wiring runs through a moving track and flexes far harder than an ordinary door's, so broken wires there are routine and it is the first place to look.
Otherwise the usual suspects for this block apply: water from a blocked door drain, a damp connector, or a broken wire in the concertina between body and door.
What this code means
The fourth door control module has stopped being heard from. See U0200 for what this family of codes means and U0201 for the rear-door considerations.
On a four-door car module D completes the set, and that makes one pattern worth checking before anything else: how many door modules are reporting.
- One door silent is a fault local to that door — its harness boot, its connector, its water ingress, its supply.
- Two or more doors silent is almost never two coincidental failures. Body modules are usually daisy-chained or share a supply and a bus branch, so the fault is upstream of both: a shared fuse, a common earth, the body control module, or the gateway.
That distinction costs nothing to establish and decides whether the next step is stripping a door card or opening a fusebox. Stripping the wrong door is several hours that a scan of the stored codes would have prevented.
On vehicles with more than four doors — vans with sliding doors, or vehicles with powered tailgates counted into the same series — module D may not be a passenger door at all. A powered sliding door is a particularly worthwhile thing to identify early, because its harness runs through a track or an articulated arm that flexes far more severely than any hinged door's boot, and broken conductors there are routine rather than unusual.
Likely causes
Start here
- Broken wire in the door harness boot · moderate
- Blocked door drain letting water into the module · easy
- Water ingress into the module connector · moderate
- Corroded or loose connector · easy
Less common
- Blown fuse or failed supply · easy
- Faulty body control module · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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