Code
P1615
HUMMER
P — Powertrain
Loss of VTD Serial Data
Views:
UK: 21
EN: 32
RU: 21
AI status
Completed
Completed
100%
Causes
- VTD module not powered (blown fuse, open circuit, poor connector)
- Bad ground(s) to VTD or PCM
- Open, shorted or corroded serial/CAN data wiring or connectors
- Failed VTD module
- Faulty PCM/BCM or other control module affecting the network
- Voltage supply problems (low battery, intermittent supply)
Symptoms
- Malfunction Indicator Lamp (MIL) or security indicator illuminated
- Possible no-start or starter disabled depending on theft deterrent state
- Loss of features controlled by VTD (security, immobilizer, related functions)
- Other control modules reporting communication errors
- Intermittent control module behavior or warning messages
What to check
- Read freeze frame and full DTC list; confirm P1615 and any other communication codes
- Verify battery voltage and condition; inspect charging system
- Check fuses and fusible links for VTD, PCM/BCM power feeds
- Visually inspect VTD connector, harness, and grounds for corrosion, bent pins, or damage
- Use scan tool to query VTD module presence on network and view data list
- Backprobe or measure voltage on data bus and module power/ground pins with key ON
Signal parameters
- CAN bus idle differential voltage ~2.5 V per line (H ~2.5 V, L ~2.5 V) or approx. 2.5 V midpoint
- Active CAN signals: alternating dominant/recessive pulses (typical 250/500 kbps depending on vehicle)
- Supply voltage to VTD ≈ 11–14 V with key ON
- Good ground resistance
- Termination resistance ≈ 60 ohms across CAN H and CAN L (two 120Ω in parallel)
Diagnostic algorithm
- Verify and record DTCs and freeze frame. Note if other communication codes are present.
- Check battery voltage and ensure proper charge (≥12.4 V at rest).
- Inspect and verify all fuses and power feeds to the VTD and related modules; repair/replace if blown.
- Visually inspect VTD module connector, pins and harness for damage, corrosion, loose or pushed out pins; repair as needed.
- Verify ground integrity: measure voltage drop between VTD ground and chassis while key ON and during attempts to start.
- With a scan tool, attempt to communicate with VTD. If no response, backprobe power and data pins at the module connector to confirm presence of 12 V and data activity.
- If power and ground present but no data, measure CAN/serial line voltages and check for bus activity with oscilloscope or capable scan tool. Look for missing/flatlined signals or shorts to Vb/GND.
- Isolate sections of the network if necessary by disconnecting other modules or removing connectors to locate a short or loading device.
- If wiring and connectors are good and network signals are absent only at the VTD, consider module failure; confirm with known-good module or manufacturer guidance before replacement.
- After repairs, clear codes, cycle ignition, and verify proper communication and functionality over representative drive/operation cycles.
Likely causes
- Blown/incorrect fuse or power feed to VTD
- Poor ground at VTD or common chassis ground
- Damaged or disconnected serial/CAN data line at connector or splice
- Failed VTD module
- Network short to battery or ground (bus short) or missing terminator
Fault status
Status
Stored when PCM detects no serial/CAN data from the VTD module. May set MIL and disable theft/immobilizer functions until communication restored.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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