P1687

Code

PLYMOUTH P — Powertrain

No Cluster Bus Message

Brand: PLYMOUTH

Type: P — Powertrain

Views: UK: 38 EN: 67 RU: 44

AI status

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Page language: EN

Failed or intermittent instrument cluster (IPC)
Open, shorted or corroded wiring on the data bus between cluster and other modules
Bad ground(s) or low battery/low system voltage
Blown fuse for instrument cluster or data bus power
Faulty body control module (BCM) or powertrain control module (PCM) affecting the bus
Aftermarket alarm/head unit/security device interfering with bus

Blank or non-responsive instrument cluster or intermittent display
Loss of speedometer/odometer, tachometer or other gauges
Some or all dash warning lamps do not illuminate or remain on
Communications errors when using a scan tool; cluster does not appear in module list
Possible no-crank/no-start or immobilizer/security symptoms if cluster provides security messages
Other modules showing related communication trouble codes

Verify battery voltage is within normal range and connections are clean/tight
Check instrument cluster and related fuses (inspect visually and test with meter)
Visually inspect cluster connector(s) and harness for damage, corrosion or water entry
Scan vehicle with a capable scan tool and confirm whether the cluster appears on the data bus
Use a DVOM or lab scope to check data-bus signal presence at the cluster connector
Check for poor chassis and battery grounds near dash/BCM/cluster

Serial data bus: dominant and recessive voltage states (idle recessive typically near battery voltage; dominant pulls toward ground)
Message activity: periodic frames from cluster (packets/sec) — absence indicates no cluster messages
Typical Chrysler/Class 2 bus baud ~10.4 kbps (verify vehicle-specific rate) — check for data traffic with scope or scan tool
Check continuity between cluster data pin and BCM/Park harness; expected low resistance (< few ohms) when intact
Look for shorts to power or ground on data line (unexpected steady voltages)

Record freeze-frame and all active/related codes with a scan tool; note whether cluster is detected on the tool.
Verify battery voltage (12.4–12.8 V engine off). Recharge if low. Retest after full charge.
Inspect and test cluster and BCM fuses. Replace any blown fuses and retest for code return.
Perform a visual inspection of cluster connector and wiring harness for damage, corrosion, or loose pins.
Check and clean ground points for instrument cluster/BCM. Re-torque fasteners to spec.
Using a scan tool, attempt to communicate directly with the cluster. If tool cannot see the cluster, suspect cluster, wiring, or bus-level fault.
Backprobe the data-bus pin at the cluster connector and observe with a scope or lab-quality scan tool for data activity. No activity: proceed to wiring checks.
Check continuity of the data-bus between the cluster and BCM/PCM; isolate sections of harness if necessary. Look for shorts to power/ground.
Disconnect non-factory accessories (alarms, remote start, radios) that tap into the wiring. Re-check communications.
If wiring and fuses are good but no data from the cluster, swap or bench-test instrument cluster per manufacturer procedure (or replace with known-good cluster) as final verification.
After repair, clear codes and perform a road test/communication check to confirm code does not return.

⚠️ Status

No Cluster Bus Message — instrument cluster not communicating on vehicle serial data bus.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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P1687 — No Cluster Bus Message