Code
P1614
HUMMER
P — Powertrain
Loss of RIM Serial Data
AI status
Completed
Completed
100%
Causes
- Open or short in the serial data bus wiring
- Corroded or loose connector at the RIM or intermediate splice
- Loss of power or ground to the RIM
- Failed RIM module (internal fault)
- Bus termination or network conflict
- Intermittent wiring damage (chafing, pinch)
Symptoms
- Malfunction of systems controlled or monitored by the RIM (varies by vehicle and RIM function)
- Related warning or message on instrument cluster
- Intermittent or permanent loss of remote/infotainment/comfort functions (locking, lighting, remote start depending on RIM role)
- Multiple communication-related DTCs present
What to check
- Scan for stored and pending DTCs and note freeze frame/information for timing and related codes
- Verify battery voltage is within specification and inspect major ground points
- Visually inspect RIM connector and wiring harness for damage, corrosion, or loose terminals
- Attempt communication with the RIM via a capable scan tool; note whether the module responds
- Check for other modules reporting lost communication on the same bus (U-codes)
- Backprobe the serial data connector to monitor signal or use a scope to view bus activity
Signal parameters
- Expected: periodic message frames from the RIM at module-specific intervals (use manufacturer data for exact IDs and rates)
- Physical layer: serial data bus should show a stable idle level and valid dominant/recessive transitions (use oscilloscope to confirm)
- Bus error counters should be low; excessive error frames indicate wiring or driver faults
- Power supply to the RIM should be stable at key-on and cranking; ground integrity required
- When present, message payloads should pass checksum/CRC and match expected module ID
Diagnostic algorithm
- Retrieve all DTCs and note any related U- or P-codes. Attempt to reflash/clear and see if code returns.
- Verify battery voltage and inspect vehicle ground straps and main power distribution to the RIM.
- Visually inspect the RIM connector, pins and harness for corrosion, bent pins, or water intrusion. Repair any poor connections.
- With a scan tool, attempt to communicate with the RIM. If no response, check fused power and ground circuits at the connector for proper voltage and continuity.
- Monitor the serial data line with a scope or logic analyzer. Look for expected message frequency, correct voltage transitions, and absence of continuous dominant or short conditions.
- Wiggle test harness and connectors while monitoring communication to reproduce intermittent loss. Isolate and repair any damaged wiring.
- If wiring and power/ground are good but no communication, disconnect suspected modules one at a time (if safe) to determine if another module is pulling the bus down.
- If the RIM is unresponsive after verifying wiring and power, consult wiring diagrams and replace the RIM following OEM procedures. Reprogram/reconfigure as required.
- After repairs, clear codes, verify communication, and perform a functional test/road test to confirm the issue is resolved.
Likely causes
- Connector/terminal corrosion or poor contact at the RIM
- Broken or shorted serial data wire between RIM and main bus
- RIM lost power or ground feed
- Failed RIM communications circuitry
- Other module driving the bus incorrectly (bus short/voltage)
Fault status
Status
Loss of serial data to or from the RIM detected — communication with the module is interrupted or absent.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
-
HUMMER: 2009
-
HUMMER: 2008
-
HUMMER: 2007
-
HUMMER: 2005
-
HUMMER: 2004
-
HUMMER: 2000
-
HUMMER: 1999
-
HUMMER: 1994
-
HUMMER: 1993
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email