Code
B1982
HUMMER
B — Body
Device Power Circuit High
AI status
Completed
Completed
100%
Causes
- Short to battery positive in the power feed or harness
- Failed module with internal regulator or protection circuit malfunction
- Aftermarket accessory wired incorrectly to the power circuit
- Corroded/damaged connector or pin making intermittent high readings
- Faulty charging system (overcharging alternator or voltage regulator)
- Incorrect battery jump-start procedures or improper battery connection
Symptoms
- Malfunction or loss of function of the affected device or system
- Illuminated warning lamp or stored fault codes related to the device
- Intermittent operation or erratic behavior of the device
- Possible blown fuses or damaged wiring insulation near the affected harness
- Battery/charging irregularities (instrument cluster voltage readouts may be high)
What to check
- Retrieve freeze-frame data and all stored codes; record conditions when code set
- Visually inspect battery, alternator connections, and main power distribution for corrosion or damage
- Inspect wiring and connectors at the affected module for heat damage, exposed conductors, or aftermarket taps
- Check and verify fuses and fusible links related to the device power circuit
- Measure supply voltage at the module connector with key ON (engine OFF) and engine RUNNING
- Verify proper grounds for the module and nearby components
Signal parameters
- Vehicle 12 V battery resting voltage: ~12.4–12.8 V
- Charging system voltage (engine running): ~13.5–14.8 V
- Module 5 V reference circuits (if present): ~4.8–5.2 V
- 3.3 V logic supplies (if present): ~3.2–3.4 V
- Condition considered 'high': supply readings significantly above charging range (e.g., >15 V) or above specification for a given reference (e.g., >5.5 V for a 5 V line); consult wiring diagram/specs for exact thresholds
Diagnostic algorithm
- Verify the MIL and confirm B1982 is current or historic; read and record freeze-frame and related codes.
- Visually inspect the module, harness, and connectors for heat damage, corrosion, or aftermarket splices. Repair visible damage.
- With the appropriate safety precautions, measure voltage at the module power pin with key ON (engine OFF). Compare to battery voltage and manufacturer specs.
- Start engine and measure charging voltage at the same point. Note any over-voltage (>14.8–15 V) that could indicate alternator/regulator issues.
- Back-probe the power feed while wiggling harness and connectors to reproduce the fault; look for intermittent spikes.
- Disconnect any suspected aftermarket accessory or non-factory tap and clear codes; see if the code returns.
- Check module ground integrity by measuring voltage drop to chassis while during typical load conditions; repair poor ground connections.
- If wiring and power distribution check out, test/replace the control module per manufacturer guidance. Consider professional bench testing of the module before replacement.
- After repair, clear codes and perform driving/operational cycle to confirm the fault does not return.
Likely causes
- Short to battery/ignition feed in wiring or connector at the affected module
- Failed control module internal regulator causing high output/readback
- Loose/corroded connector that intermittently causes spurious voltage spikes
- Aftermarket accessory incorrectly tied into the module power circuit
Fault status
Status
B1982 — Device Power Circuit High: stored when the module detects a power supply voltage higher than its permitted threshold.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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Code
B1982
Other
B — Body
Driver's Door Unlock Relay Circuit Failure
AI status
Completed
Completed
100%
Causes
- Short to battery positive in the power feed or harness
- Failed module with internal regulator or protection circuit malfunction
- Aftermarket accessory wired incorrectly to the power circuit
- Corroded/damaged connector or pin making intermittent high readings
- Faulty charging system (overcharging alternator or voltage regulator)
- Incorrect battery jump-start procedures or improper battery connection
Symptoms
- Malfunction or loss of function of the affected device or system
- Illuminated warning lamp or stored fault codes related to the device
- Intermittent operation or erratic behavior of the device
- Possible blown fuses or damaged wiring insulation near the affected harness
- Battery/charging irregularities (instrument cluster voltage readouts may be high)
What to check
- Retrieve freeze-frame data and all stored codes; record conditions when code set
- Visually inspect battery, alternator connections, and main power distribution for corrosion or damage
- Inspect wiring and connectors at the affected module for heat damage, exposed conductors, or aftermarket taps
- Check and verify fuses and fusible links related to the device power circuit
- Measure supply voltage at the module connector with key ON (engine OFF) and engine RUNNING
- Verify proper grounds for the module and nearby components
Signal parameters
- Vehicle 12 V battery resting voltage: ~12.4–12.8 V
- Charging system voltage (engine running): ~13.5–14.8 V
- Module 5 V reference circuits (if present): ~4.8–5.2 V
- 3.3 V logic supplies (if present): ~3.2–3.4 V
- Condition considered 'high': supply readings significantly above charging range (e.g., >15 V) or above specification for a given reference (e.g., >5.5 V for a 5 V line); consult wiring diagram/specs for exact thresholds
Diagnostic algorithm
- Verify the MIL and confirm B1982 is current or historic; read and record freeze-frame and related codes.
- Visually inspect the module, harness, and connectors for heat damage, corrosion, or aftermarket splices. Repair visible damage.
- With the appropriate safety precautions, measure voltage at the module power pin with key ON (engine OFF). Compare to battery voltage and manufacturer specs.
- Start engine and measure charging voltage at the same point. Note any over-voltage (>14.8–15 V) that could indicate alternator/regulator issues.
- Back-probe the power feed while wiggling harness and connectors to reproduce the fault; look for intermittent spikes.
- Disconnect any suspected aftermarket accessory or non-factory tap and clear codes; see if the code returns.
- Check module ground integrity by measuring voltage drop to chassis while during typical load conditions; repair poor ground connections.
- If wiring and power distribution check out, test/replace the control module per manufacturer guidance. Consider professional bench testing of the module before replacement.
- After repair, clear codes and perform driving/operational cycle to confirm the fault does not return.
Likely causes
- Short to battery/ignition feed in wiring or connector at the affected module
- Failed control module internal regulator causing high output/readback
- Loose/corroded connector that intermittently causes spurious voltage spikes
- Aftermarket accessory incorrectly tied into the module power circuit
Fault status
Status
B1982 — Device Power Circuit High: stored when the module detects a power supply voltage higher than its permitted threshold.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Brands with available manuals
6,846
The library contains 6,846 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
Your experience will help others
+100 karma for a short comment :)
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