Code
P1624
CADILLAC
P — Powertrain
Customer Snapshot Data Available
AI status
Completed
Completed
100%
Causes
- A previous or intermittent fault/trip condition was detected and the ECU logged a customer snapshot.
- Power interruption or key cycle that triggered snapshot capture.
- A diagnostic event or service operation caused the module to store snapshot data.
- Software/calibration behavior that logs events for later review.
- CAN or module communication events causing an event record to be stored.
Symptoms
- No specific drivability symptom required — this code is informational.
- Malfunction Indicator Lamp (MIL) may or may not be illuminated depending on related faults.
- Scan tool shows a stored customer snapshot/freeze frame available to view.
- Possible one-time or intermittent performance issues that correspond with the snapshot timestamp.
What to check
- Connect a capable GM scan tool and retrieve P1624 details and the stored customer snapshot/freeze-frame data.
- Read and record all other stored DTCs and pending codes from all modules (powertrain, BCM, ABS, etc.).
- Note the timestamp and all freeze-frame parameters: rpm, vehicle speed, throttle position, coolant temp, battery voltage, etc.
- Clear codes and snapshots, then attempt to replicate the condition with data logging or road test while monitoring PIDs.
- Check battery voltage and charging system health; inspect for recent battery disconnects or low-voltage events.
- Inspect relevant sensor/actuator circuits and connectors that correspond to any additional DTCs found.
Signal parameters
- Snapshot timestamp/date/time recorded by module
- Engine speed (RPM) at event
- Vehicle speed at event
- Throttle position / pedal position
- Engine coolant temperature
- Intake air temperature and MAF/VAF readings
Diagnostic algorithm
- Connect GM-capable scan tool and download the stored customer snapshot for P1624; save or print snapshot and related freeze-frame data.
- Record all active, pending and stored DTCs from all modules; note any codes that correlate with the snapshot timestamp.
- Interpret snapshot values to identify which sensor or system was abnormal at the time (e.g., high fuel trim, sudden drop in battery voltage, sensor out-of-range).
- Clear codes and snapshots, then attempt to reproduce the condition: perform a monitored road test or stress tests that replicate snapshot conditions while logging relevant PIDs.
- If a related sensor or circuit is implicated, perform targeted electrical checks: wiring continuity, connector condition, reference voltages, and sensor outputs against factory specifications.
- If communications errors are suspected, inspect CAN wiring, terminals, and perform module wake/scan tests. Check for module reboots or message loss during the event time.
- Check battery and charging system for healthy voltage during cranking and while running; repair as needed.
- If no root cause is found and snapshot does not recur, document findings and advise customer. If related faults persist, follow diagnostic procedures for the specific DTCs found or escalate to dealer support/technical resources.
Likely causes
- Transient sensor/actuator fault (momentary loss or out-of-range reading) that generated an event.
- Low battery voltage or cranking condition when an event occurred.
- Intermittent wiring or connector problem affecting a sensor or CAN bus.
- Pending or stored related fault codes in another module that triggered the snapshot.
- Module software flagged conditions requiring a snapshot (may be normal operation for certain events).
Fault status
Status
Customer Snapshot Data Available — an event/freeze-frame was logged in the vehicle control module. Use a GM-capable scan tool to view snapshot and related DTCs.
Repair difficulty: Easy
Diagnostic time: 0.5-2.0 hours (30–120 minutes)
Similar codes
Repair manuals
Manual library for CADILLAC
40
Browse 40 CADILLAC manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
CADILLAC
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CADILLAC: 2020
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