Corroded, loose, or backed-out terminals at the DIM connector or the BCM connector; Chafed or broken serial data wire between the DIM and the BCM, often near the steering column or dash harness; Failed DIM internal power or ground circuit causing the module to drop offline intermittently; Low battery voltage or a weak charging system that browns out the DIM during cranking; Aftermarket electronics tapped into the class 2 data line, such as remote starters or alarm systems; Water intrusion into the DIM or BCM connector causing intermittent shorts on the data circuit

DTC codes / GM codes / P1613

P1613 · GMLoss Of DIM Serial Data

Q: What does code P1613 mean?

Loss Of DIM Serial Data. P1613 on a GM vehicle means the Body Control Module (BCM) or another module on the serial data bus has lost communication with the Driver Information Module (DIM), which is the instrument cluster that displays mileage, warnings, and driver messages. The computer detected a missing or intermittent serial data message from the DIM over the class 2 or GMLAN data circuit, not a failure inside the DIM itself.

P1613 on a GM vehicle means the Body Control Module (BCM) or another module on the serial data bus has lost communication with the Driver Information Module (DIM), which is the instrument cluster that displays mileage, warnings, and driver messages. The computer detected a missing or intermittent serial data message from the DIM over the class 2 or GMLAN data circuit, not a failure inside the DIM itself.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

Symptoms you may notice

Instrument cluster gauges, odometer, or driver information display may go blank or show dashes
Warning chimes and turn signal clicks may stop working or behave erratically
Other modules may log unrelated communication codes because the data bus is disrupted
Intermittent no-start or security light issues if the BCM cannot verify the DIM handshake
Often no symptoms besides the warning light if the fault is a stored history code from a brief glitch

Common causes, most likely first

Corroded, loose, or backed-out terminals at the DIM connector or the BCM connector
Chafed or broken serial data wire between the DIM and the BCM, often near the steering column or dash harness
Failed DIM internal power or ground circuit causing the module to drop offline intermittently
Low battery voltage or a weak charging system that browns out the DIM during cranking
Aftermarket electronics tapped into the class 2 data line, such as remote starters or alarm systems
Water intrusion into the DIM or BCM connector causing intermittent shorts on the data circuit

How to diagnose and fix it

Clear the code and verify whether P1613 returns as current or history after a test drive with all accessories off
Inspect and wiggle-test the DIM connector and BCM connector for corrosion, loose pins, and pushed-out terminals
Measure battery voltage at rest and during cranking, and load-test the battery and charging system
Check the serial data circuit for continuity and shorts to ground or power between the DIM and BCM
Disconnect any aftermarket electronics spliced into the data bus and retest for the code
If wiring and power are good, substitute a known-good DIM or reflash the BCM only after confirming the data line is intact
Perform a full module scan and repair any other communication codes before condemning the DIM

What the DIM serial code really means

P1613 is a communication loss code, so replacing the instrument cluster first is the most common and most expensive misdiagnosis when the real fault is a chafed wire or a weak battery.
A brief voltage dip during engine cranking can set P1613 as a history code without any hard failure, so always check battery health before chasing wiring.
Aftermarket remote starters and alarm systems spliced into the class 2 data line frequently cause intermittent P1613 because they corrupt the serial message the BCM expects from the DIM.
The DIM shares its serial data circuit with other modules, so a single shorted module on the bus can make P1613 appear alongside unrelated U-codes that point away from the real culprit.
On some GM platforms the DIM is called the instrument cluster and the same loss of serial data can set P1613 even when the cluster powers up normally, because the code tracks the data message rather than the display.

Can I keep driving with P1613?

You can usually drive the vehicle with P1613 because the fault affects driver information and communication rather than engine control, but avoid long trips until the cause is found. If the cluster goes blank or warning chimes stop working, have the circuit inspected promptly because other safety messages may also be lost.

Tools that help

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Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.