Code
P1613
HUMMER
P — Powertrain
Loss of DIM Serial Data
AI status
Completed
Completed
100%
Causes
- Open or shorted data bus wiring (CAN/LIN) between DIM and network
- Corroded or loose connector at DIM or gateway module
- Blown fuse or poor battery/ground connection
- Failed DIM or gateway/communication module
- Missing/incorrect module programming or software fault
- Improper termination or short to voltage/ground on data bus
Symptoms
- Instrument cluster display blank or intermittent
- Gauges, warning lamps, or messages not functioning
- Other modules reporting communication errors
- Related features (chimes, driver info, trip computer) inoperative
- Possible abnormal vehicle enter/exit behavior or erratic dashboard indications
What to check
- Scan vehicle network with a capable scan tool; record related U-codes and module presence
- Verify battery voltage stable (12.4–14.6 V) and good battery connections
- Inspect DIM connector and junctions for corrosion, bent pins, or looseness
- Check fuses and power/ground circuits for DIM and gateway modules
- Visually inspect CAN/LIN wiring for damage, pinched areas, or aftermarket splices
- Measure CAN bus resistance across CANH/CANL (approx. 60 ohms total for two 120-ohm terminators)
Signal parameters
- CAN idle voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V (each relative to chassis ground)
- CAN dominant state: CANH ~3.5 V, CANL ~1.5 V (approximate differential ≈ 2 V)
- Expected bus termination: ~60 ohms measured across CANH to CANL (two 120 ohm terminators in parallel)
- LIN idle: near battery voltage via pull‑up; LIN frames pull to ground during transmission
- Data traffic: DIM should transmit periodic messages — absence of DIM message IDs indicates loss of module communication
Diagnostic algorithm
- Connect a scan tool and read all DTCs. Note any additional U-codes (lost comm with other modules).
- Verify battery voltage and grounds. Recharge/replace battery if voltage low; clean and tighten ground straps.
- Inspect DIM connector and harness for damage, corrosion, or loose pins. Repair any connector issues.
- Check fuses and power feeds to DIM and gateway; repair blown fuses or open circuits.
- With scan tool, verify that the DIM is present on the network. If DIM ID/messages are absent, proceed to wiring checks.
- Measure continuity between DIM connector pins and the gateway/ECM connector for CANH/CANL (or LIN) circuits. Repair any opens or shorts.
- Measure resistance across CANH and CANL at two different points to confirm proper termination (~60 ohms).
- Use an oscilloscope or bus monitor to observe CAN/LIN signals while operating related systems. Look for corrupted signals, stuck high/low, or intermittent toggling.
- If wiring and bus signals are good, attempt software/ECU communication update or reflash per manufacturer procedures.
- If module is confirmed not to transmit/receive and wiring/bus are verified good, replace the DIM per service manual and recheck network communication.
- Clear codes and road test to confirm repair. If intermittent, inspect routing and secure harness to prevent future chafing.
Likely causes
- Damaged/loose DIM connector or pins
- Broken or chafed CAN/LIN wires near harness joints or door sills
- Faulty ground at instrument panel or body ground strap
- Failed instrument cluster/DIM module
- Intermittent battery voltage causing module brownout
Fault status
Status
Loss of serial data to Driver Information Module (DIM) — communication failure detected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Repair manuals
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138
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