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Home / DTC / B1552 — Keep Alive Memory (KAM) Error

B1552 — Keep Alive Memory (KAM) Error

Detailed page for trouble code B1552.

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22,491specific
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Code

B1552

HUMMER B — Body

Keep Alive Memory (KAM) Error

Brand: HUMMER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vehicle battery low or failing
  • Poor battery or ground connections (corrosion, loose terminals)
  • Blown or intermittent KAM/backup fuse or fusible link
  • Failed KAM backup device (supercapacitor or internal battery)
  • Damaged wiring or connector to KAM backup circuit
  • Parasitic battery drain removing backup power

Symptoms

  • DTC B1552 stored and may reappear after power cycles
  • Loss of radio presets, clock resets, or other saved settings
  • Loss of adaptive or learned parameters (transmission, idle knock, etc.)
  • Intermittent or permanent instrument cluster or body control faults
  • Unexpected behavior after battery disconnect or replacement
  • Possible no-start or drivability issues if module depended on KAM data

What to check

  • Use a scan tool to read all DTCs and freeze-frame data; note related codes
  • Check battery state of charge and charging system (voltage and cranking)
  • Inspect battery terminals, cables, and engine/chassis ground connections
  • Check KAM/backup and related fuses, fusible links and relay operation
  • Visually inspect wiring and connectors to the affected module for damage or corrosion
  • Measure KAM backup supply voltage at module and at fuse with key off

Signal parameters

  • Battery voltage (key off, key on, during cranking)
  • Module KAM/backup supply voltage with ignition off
  • Ignition supply voltage and ground continuity at module
  • Freeze frame data indicating when the fault set (ignition state, voltage)
  • Parasitic current draw in milliamps (mA) while vehicle is asleep
  • Module internal status/health parameters (if available via OEM scanner)

Diagnostic algorithm

  1. Connect a capable scan tool, record B1552 and any other codes/freeze frame information. Note ignition state when code set.
  2. Verify battery voltage (resting and cranking) and charging system. Recharge or replace battery if low.
  3. Inspect battery terminals, cable ends and ground straps for tightness and corrosion; clean and retighten as needed.
  4. Locate and inspect KAM/backup fuse(s) and associated fusible links; replace any blown fuses and check for good fuse contact.
  5. Inspect wiring and connectors between battery/fuse and the affected module; repair damaged insulation, pins, or corrosion.
  6. With ignition off, measure backup/KAM supply voltage at the module and at the fuse. Compare to manufacturer specification. If voltage is below spec, trace supply back to source (backup capacitor, internal module power, or battery feed).
  7. Check for abnormal parasitic drain that could discharge backup devices; isolate circuits to find culprit if excessive draw found.
  8. If wiring and power are good, perform a module power-cycling test: clear codes, apply known-good battery power, then cycle ignition and recheck. If intermittent, attempt stable power for several key cycles.
  9. If fault persists and all external power/wiring/fuses are good, check for available software updates and reflash/reprogram the module per OEM procedure.
  10. If diagnostics indicate internal memory or KAM device failure, replace the affected control module or its KAM component and follow programming/initialization procedures. Clear codes and verify repair by road test and repeated key cycles.
  11. Note: follow OEM service manual for exact test points, voltages and procedures. Do not perform module replacement until external circuits and fuses are verified good.

Likely causes

  • Weak/dead vehicle battery or poor battery connections
  • Blown KAM/backup fuse or poor fuse contact
  • Failed KAM backup capacitor/battery inside module
  • Damaged wiring/connector to module power or ground
  • Internal module memory fault or firmware corruption

Fault status

⚠️ Status
Keep Alive Memory error — the control module reports that its non-volatile memory or backup power source has failed or been lost. Investigate battery, KAM backup circuit, fuses, wiring, and module integrity. May be intermittent or permanent until underlying cause is fixed.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1550 B1551 B1553 P0601 P0602 U0100
Repair manuals

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Code

B1552

MITSUBISHI B — Body

Change circuit for PWR.supply SH

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vehicle battery low or failing
  • Poor battery or ground connections (corrosion, loose terminals)
  • Blown or intermittent KAM/backup fuse or fusible link
  • Failed KAM backup device (supercapacitor or internal battery)
  • Damaged wiring or connector to KAM backup circuit
  • Parasitic battery drain removing backup power

Symptoms

  • DTC B1552 stored and may reappear after power cycles
  • Loss of radio presets, clock resets, or other saved settings
  • Loss of adaptive or learned parameters (transmission, idle knock, etc.)
  • Intermittent or permanent instrument cluster or body control faults
  • Unexpected behavior after battery disconnect or replacement
  • Possible no-start or drivability issues if module depended on KAM data

What to check

  • Use a scan tool to read all DTCs and freeze-frame data; note related codes
  • Check battery state of charge and charging system (voltage and cranking)
  • Inspect battery terminals, cables, and engine/chassis ground connections
  • Check KAM/backup and related fuses, fusible links and relay operation
  • Visually inspect wiring and connectors to the affected module for damage or corrosion
  • Measure KAM backup supply voltage at module and at fuse with key off

Signal parameters

  • Battery voltage (key off, key on, during cranking)
  • Module KAM/backup supply voltage with ignition off
  • Ignition supply voltage and ground continuity at module
  • Freeze frame data indicating when the fault set (ignition state, voltage)
  • Parasitic current draw in milliamps (mA) while vehicle is asleep
  • Module internal status/health parameters (if available via OEM scanner)

Diagnostic algorithm

  1. Connect a capable scan tool, record B1552 and any other codes/freeze frame information. Note ignition state when code set.
  2. Verify battery voltage (resting and cranking) and charging system. Recharge or replace battery if low.
  3. Inspect battery terminals, cable ends and ground straps for tightness and corrosion; clean and retighten as needed.
  4. Locate and inspect KAM/backup fuse(s) and associated fusible links; replace any blown fuses and check for good fuse contact.
  5. Inspect wiring and connectors between battery/fuse and the affected module; repair damaged insulation, pins, or corrosion.
  6. With ignition off, measure backup/KAM supply voltage at the module and at the fuse. Compare to manufacturer specification. If voltage is below spec, trace supply back to source (backup capacitor, internal module power, or battery feed).
  7. Check for abnormal parasitic drain that could discharge backup devices; isolate circuits to find culprit if excessive draw found.
  8. If wiring and power are good, perform a module power-cycling test: clear codes, apply known-good battery power, then cycle ignition and recheck. If intermittent, attempt stable power for several key cycles.
  9. If fault persists and all external power/wiring/fuses are good, check for available software updates and reflash/reprogram the module per OEM procedure.
  10. If diagnostics indicate internal memory or KAM device failure, replace the affected control module or its KAM component and follow programming/initialization procedures. Clear codes and verify repair by road test and repeated key cycles.
  11. Note: follow OEM service manual for exact test points, voltages and procedures. Do not perform module replacement until external circuits and fuses are verified good.

Likely causes

  • Weak/dead vehicle battery or poor battery connections
  • Blown KAM/backup fuse or poor fuse contact
  • Failed KAM backup capacitor/battery inside module
  • Damaged wiring/connector to module power or ground
  • Internal module memory fault or firmware corruption

Fault status

⚠️ Status
Keep Alive Memory error — the control module reports that its non-volatile memory or backup power source has failed or been lost. Investigate battery, KAM backup circuit, fuses, wiring, and module integrity. May be intermittent or permanent until underlying cause is fixed.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1550 B1551 B1553 P0601 P0602 U0100
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

B1552

Other B — Body

Decklid Release Circuit Open

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vehicle battery low or failing
  • Poor battery or ground connections (corrosion, loose terminals)
  • Blown or intermittent KAM/backup fuse or fusible link
  • Failed KAM backup device (supercapacitor or internal battery)
  • Damaged wiring or connector to KAM backup circuit
  • Parasitic battery drain removing backup power

Symptoms

  • DTC B1552 stored and may reappear after power cycles
  • Loss of radio presets, clock resets, or other saved settings
  • Loss of adaptive or learned parameters (transmission, idle knock, etc.)
  • Intermittent or permanent instrument cluster or body control faults
  • Unexpected behavior after battery disconnect or replacement
  • Possible no-start or drivability issues if module depended on KAM data

What to check

  • Use a scan tool to read all DTCs and freeze-frame data; note related codes
  • Check battery state of charge and charging system (voltage and cranking)
  • Inspect battery terminals, cables, and engine/chassis ground connections
  • Check KAM/backup and related fuses, fusible links and relay operation
  • Visually inspect wiring and connectors to the affected module for damage or corrosion
  • Measure KAM backup supply voltage at module and at fuse with key off

Signal parameters

  • Battery voltage (key off, key on, during cranking)
  • Module KAM/backup supply voltage with ignition off
  • Ignition supply voltage and ground continuity at module
  • Freeze frame data indicating when the fault set (ignition state, voltage)
  • Parasitic current draw in milliamps (mA) while vehicle is asleep
  • Module internal status/health parameters (if available via OEM scanner)

Diagnostic algorithm

  1. Connect a capable scan tool, record B1552 and any other codes/freeze frame information. Note ignition state when code set.
  2. Verify battery voltage (resting and cranking) and charging system. Recharge or replace battery if low.
  3. Inspect battery terminals, cable ends and ground straps for tightness and corrosion; clean and retighten as needed.
  4. Locate and inspect KAM/backup fuse(s) and associated fusible links; replace any blown fuses and check for good fuse contact.
  5. Inspect wiring and connectors between battery/fuse and the affected module; repair damaged insulation, pins, or corrosion.
  6. With ignition off, measure backup/KAM supply voltage at the module and at the fuse. Compare to manufacturer specification. If voltage is below spec, trace supply back to source (backup capacitor, internal module power, or battery feed).
  7. Check for abnormal parasitic drain that could discharge backup devices; isolate circuits to find culprit if excessive draw found.
  8. If wiring and power are good, perform a module power-cycling test: clear codes, apply known-good battery power, then cycle ignition and recheck. If intermittent, attempt stable power for several key cycles.
  9. If fault persists and all external power/wiring/fuses are good, check for available software updates and reflash/reprogram the module per OEM procedure.
  10. If diagnostics indicate internal memory or KAM device failure, replace the affected control module or its KAM component and follow programming/initialization procedures. Clear codes and verify repair by road test and repeated key cycles.
  11. Note: follow OEM service manual for exact test points, voltages and procedures. Do not perform module replacement until external circuits and fuses are verified good.

Likely causes

  • Weak/dead vehicle battery or poor battery connections
  • Blown KAM/backup fuse or poor fuse contact
  • Failed KAM backup capacitor/battery inside module
  • Damaged wiring/connector to module power or ground
  • Internal module memory fault or firmware corruption

Fault status

⚠️ Status
Keep Alive Memory error — the control module reports that its non-volatile memory or backup power source has failed or been lost. Investigate battery, KAM backup circuit, fuses, wiring, and module integrity. May be intermittent or permanent until underlying cause is fixed.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

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B1550 B1551 B1553 P0601 P0602 U0100
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