U1716

Code

ALFA ROMEO U — Network/User

CAN bus communication between engine control module and cruise control adaptation

Brand: ALFA ROMEO

Type: U — Network/User

Views: UK: 2 EN: 3 RU: 4

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or chafed CAN wiring between ECM and cruise/cruise-adaptation module
Corroded or loose connectors or pins at ECM, cruise module or junctions
Failed or intermittent ground or power supply to one of the modules
Missing or incorrect CAN termination (open/shorted termination resistor)
Failed cruise control module or failed ECM hardware
Software/firmware mismatch or corrupted adaptation data in one module

Symptoms

Cruise control unavailable or inoperative
Intermittent cruise function — works then drops out
Related warning lamp or message on cluster (e.g., cruise or electronic stability/can network warnings)
Stored CAN communication U-codes and history in scan tool
Other convenience features tied to cruise adaptation may behave incorrectly

What to check

Check vehicle battery state-of-charge and charging system; ensure stable voltage during diagnosis
Use OEM scan tool: read freeze frame, event counters and full U/CAN code list; note code occurrence conditions
Visually inspect wiring and connectors for damage, corrosion, loose pins at ECM, cruise module and any intermediate junctions
Check and verify fuses/power feeds and ground points for ECM and cruise control module
With keys on (engine off) measure CAN bus voltages at a known good connector: CAN_H and CAN_L idle voltages and between them
Measure termination resistance across CAN_H and CAN_L with power off (should be ~60 Ω for a properly terminated network)

Signal parameters

CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each referenced to chassis)
Dominant state differential ≈ 1.5–2.5 V (CAN_H rises, CAN_L falls)
Termination resistance across CAN_H and CAN_L ≈ 60 Ω (two 120 Ω in parallel)
Bus bit rate depends on vehicle (commonly 250 kb/s or 500 kb/s on powertrain nets)
Expected presence of specific CAN IDs/messages for cruise control/adaptation at periodic rates (use OEM reference or CAN analyzer)

Diagnostic algorithm

Record all codes and live data with an OEM-quality scan tool; note when and how U1716 sets.
Verify battery voltage and ground integrity; perform voltage drop checks on main grounds powering ECM and cruise module.
Visually inspect harnesses and connectors between ECM and cruise module; repair any damage or corrosion.
With ignition ON, measure CAN_H and CAN_L idle voltages at a service connector; confirm they are near expected levels (~2.5 V).
With power off, measure termination resistance between CAN_H and CAN_L (~60 Ω).
Use an oscilloscope or CAN bus analyzer to capture traffic and error frames while attempting to operate cruise or reproduce the fault. Identify missing arbitration IDs or error bursts.
Perform a wiggle test of harness/connectors while monitoring CAN frames to locate intermittent faults.
If a specific module is not transmitting or receiving, verify its power and ground. Swap with a known-good unit only if supported by procedure and after programming considerations.
Check for and apply any available ECU/module software updates or calibration recalls. Reprogram/adapt modules if required by manufacturer procedure.
After repairs, clear codes and re-test; perform a road test to confirm cruise adaptation and communication remain stable.
If fault persists and wiring is confirmed good, follow OEM module replacement/repair procedures for ECM or cruise control module.

Likely causes

Broken or shorted CAN_H or CAN_L conductor in harness near engine bay
Corroded connector at ECM or cruise control module (water ingress)
Loss of module ground at cruise control module or ECM causing one-sided communication
Failed cruise control actuator/module internal transceiver
Missing termination resistor at one end of the bus (~60 Ω across CAN_H/CAN_L)
ECM software inconsistency after a recent update or adaptation reset

Fault status

⚠️ Status

CAN communication fault detected between Engine Control Module and cruise control adaptation — messages missing or corrupted.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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Code

U1716

FIAT U — Network/User

CAN bus communication between engine control module and cruise control adaptation

Brand: FIAT

Type: U — Network/User

Views: UK: 2 EN: 4 RU: 3

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or chafed CAN wiring between ECM and cruise/cruise-adaptation module
Corroded or loose connectors or pins at ECM, cruise module or junctions
Failed or intermittent ground or power supply to one of the modules
Missing or incorrect CAN termination (open/shorted termination resistor)
Failed cruise control module or failed ECM hardware
Software/firmware mismatch or corrupted adaptation data in one module

Symptoms

Cruise control unavailable or inoperative
Intermittent cruise function — works then drops out
Related warning lamp or message on cluster (e.g., cruise or electronic stability/can network warnings)
Stored CAN communication U-codes and history in scan tool
Other convenience features tied to cruise adaptation may behave incorrectly

What to check

Check vehicle battery state-of-charge and charging system; ensure stable voltage during diagnosis
Use OEM scan tool: read freeze frame, event counters and full U/CAN code list; note code occurrence conditions
Visually inspect wiring and connectors for damage, corrosion, loose pins at ECM, cruise module and any intermediate junctions
Check and verify fuses/power feeds and ground points for ECM and cruise control module
With keys on (engine off) measure CAN bus voltages at a known good connector: CAN_H and CAN_L idle voltages and between them
Measure termination resistance across CAN_H and CAN_L with power off (should be ~60 Ω for a properly terminated network)

Signal parameters

CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each referenced to chassis)
Dominant state differential ≈ 1.5–2.5 V (CAN_H rises, CAN_L falls)
Termination resistance across CAN_H and CAN_L ≈ 60 Ω (two 120 Ω in parallel)
Bus bit rate depends on vehicle (commonly 250 kb/s or 500 kb/s on powertrain nets)
Expected presence of specific CAN IDs/messages for cruise control/adaptation at periodic rates (use OEM reference or CAN analyzer)

Diagnostic algorithm

Record all codes and live data with an OEM-quality scan tool; note when and how U1716 sets.
Verify battery voltage and ground integrity; perform voltage drop checks on main grounds powering ECM and cruise module.
Visually inspect harnesses and connectors between ECM and cruise module; repair any damage or corrosion.
With ignition ON, measure CAN_H and CAN_L idle voltages at a service connector; confirm they are near expected levels (~2.5 V).
With power off, measure termination resistance between CAN_H and CAN_L (~60 Ω).
Use an oscilloscope or CAN bus analyzer to capture traffic and error frames while attempting to operate cruise or reproduce the fault. Identify missing arbitration IDs or error bursts.
Perform a wiggle test of harness/connectors while monitoring CAN frames to locate intermittent faults.
If a specific module is not transmitting or receiving, verify its power and ground. Swap with a known-good unit only if supported by procedure and after programming considerations.
Check for and apply any available ECU/module software updates or calibration recalls. Reprogram/adapt modules if required by manufacturer procedure.
After repairs, clear codes and re-test; perform a road test to confirm cruise adaptation and communication remain stable.
If fault persists and wiring is confirmed good, follow OEM module replacement/repair procedures for ECM or cruise control module.

Likely causes

Broken or shorted CAN_H or CAN_L conductor in harness near engine bay
Corroded connector at ECM or cruise control module (water ingress)
Loss of module ground at cruise control module or ECM causing one-sided communication
Failed cruise control actuator/module internal transceiver
Missing termination resistor at one end of the bus (~60 Ω across CAN_H/CAN_L)
ECM software inconsistency after a recent update or adaptation reset

Fault status

⚠️ Status

CAN communication fault detected between Engine Control Module and cruise control adaptation — messages missing or corrupted.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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Code

U1716

HUMMER U — Network/User

Loss of Front Door Module to Window Motor Normal Speed Comm.

Brand: HUMMER

Type: U — Network/User

Views: UK: 6 EN: 7 RU: 6

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or chafed CAN wiring between ECM and cruise/cruise-adaptation module
Corroded or loose connectors or pins at ECM, cruise module or junctions
Failed or intermittent ground or power supply to one of the modules
Missing or incorrect CAN termination (open/shorted termination resistor)
Failed cruise control module or failed ECM hardware
Software/firmware mismatch or corrupted adaptation data in one module

Symptoms

Cruise control unavailable or inoperative
Intermittent cruise function — works then drops out
Related warning lamp or message on cluster (e.g., cruise or electronic stability/can network warnings)
Stored CAN communication U-codes and history in scan tool
Other convenience features tied to cruise adaptation may behave incorrectly

What to check

Check vehicle battery state-of-charge and charging system; ensure stable voltage during diagnosis
Use OEM scan tool: read freeze frame, event counters and full U/CAN code list; note code occurrence conditions
Visually inspect wiring and connectors for damage, corrosion, loose pins at ECM, cruise module and any intermediate junctions
Check and verify fuses/power feeds and ground points for ECM and cruise control module
With keys on (engine off) measure CAN bus voltages at a known good connector: CAN_H and CAN_L idle voltages and between them
Measure termination resistance across CAN_H and CAN_L with power off (should be ~60 Ω for a properly terminated network)

Signal parameters

CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each referenced to chassis)
Dominant state differential ≈ 1.5–2.5 V (CAN_H rises, CAN_L falls)
Termination resistance across CAN_H and CAN_L ≈ 60 Ω (two 120 Ω in parallel)
Bus bit rate depends on vehicle (commonly 250 kb/s or 500 kb/s on powertrain nets)
Expected presence of specific CAN IDs/messages for cruise control/adaptation at periodic rates (use OEM reference or CAN analyzer)

Diagnostic algorithm

Record all codes and live data with an OEM-quality scan tool; note when and how U1716 sets.
Verify battery voltage and ground integrity; perform voltage drop checks on main grounds powering ECM and cruise module.
Visually inspect harnesses and connectors between ECM and cruise module; repair any damage or corrosion.
With ignition ON, measure CAN_H and CAN_L idle voltages at a service connector; confirm they are near expected levels (~2.5 V).
With power off, measure termination resistance between CAN_H and CAN_L (~60 Ω).
Use an oscilloscope or CAN bus analyzer to capture traffic and error frames while attempting to operate cruise or reproduce the fault. Identify missing arbitration IDs or error bursts.
Perform a wiggle test of harness/connectors while monitoring CAN frames to locate intermittent faults.
If a specific module is not transmitting or receiving, verify its power and ground. Swap with a known-good unit only if supported by procedure and after programming considerations.
Check for and apply any available ECU/module software updates or calibration recalls. Reprogram/adapt modules if required by manufacturer procedure.
After repairs, clear codes and re-test; perform a road test to confirm cruise adaptation and communication remain stable.
If fault persists and wiring is confirmed good, follow OEM module replacement/repair procedures for ECM or cruise control module.

Likely causes

Broken or shorted CAN_H or CAN_L conductor in harness near engine bay
Corroded connector at ECM or cruise control module (water ingress)
Loss of module ground at cruise control module or ECM causing one-sided communication
Failed cruise control actuator/module internal transceiver
Missing termination resistor at one end of the bus (~60 Ω across CAN_H/CAN_L)
ECM software inconsistency after a recent update or adaptation reset

Fault status

⚠️ Status

CAN communication fault detected between Engine Control Module and cruise control adaptation — messages missing or corrupted.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

Your experience will help others

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