Chevrolet B1325 Code: Device Power Circuit Voltage (Low/High)
A GM body module saw its supply voltage drop too low or rise too high, usually a battery issue.
At a glance
Severity: Low
- Meaning
- Device Power Circuit Voltage (Low/High)
- System
- Body Systems · Body
- Safe to drive?
- Yes, short term
- Typical repair cost
- $0–$800
- DIY difficulty
- Easy
B1325 is GM's 'device power' code: modules such as the body control module, instrument cluster, radio, HVAC control and airbag module watch the voltage on their own power input and store B1325 when it stays outside the normal window for several seconds. The symptom byte tells you which way: 03 means voltage below threshold (often around 9 V), and 07 means above threshold. Because several modules can log it at once, B1325 03 is really a snapshot of a low-voltage event: a tired battery during cranking, a car that sat for weeks, a jump start, or a loose terminal. It shows up often on the HHR, Cruze and Silverado, and fixing the power supply usually ends it without touching any module.
Can I keep driving? Safe to drive, but treat it as an early warning that the battery or charging system may leave you stranded. Test the battery and charging voltage soon, especially before cold weather.
Try this first – 5-minute fix
- Clean and tighten the battery terminals Remove the negative cable first, clean both terminals and cable ends, then tighten them firmly; GM side-post bolts often feel tight but make poor contact. Clear the codes afterward.
- Charge and test the battery Fully charge the battery with a charger, let it rest a few hours and check it reads about 12.6 V. Have it load-tested for free at most parts stores; replace it if it fails.
- Clear codes and watch for a repeat Clear B1325 from all modules and drive normally for a week. If it doesn't come back, the low-voltage event was the whole story.
How to read B1325
- B Body
- 1 Manufacturer-specific
- 3 Body Systems
- 25 Specific fault
Symptoms
- Radio presets or clock reset, or the radio reboots while cranking
- Slow cranking or a click-no-start after sitting
- Dim or flickering interior lights and gauges
- Several modules show B1325 at the same time on a full scan
- Random electrical glitches that clear after a restart
- Battery or charging warning on the dash (with symptom byte 07 or a charging fault)
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- Weak or aging battery that sags during cranking or after sitting
- Loose or corroded battery terminals, including GM side-post bolts
- Battery drained by a parasitic draw, a light left on or long storage
- Charging problem: weak alternator or bad charge cable (symptom 07 if overcharging)
- High-resistance ground at the engine, body or module
- Jump start, battery charger or aftermarket accessory causing a voltage spike or dip
Diagnosis step by step
Scan all modules and note the symptom byte
Use a scan tool that reads body modules. Note which modules stored B1325 and whether it's 03 (low) or 07 (high); a single module with the code points to that module's feed, several modules point to the battery or charging system.
Tools: OBD-II scanner
Measure resting and cranking voltage
After the car sits overnight, a healthy battery reads about 12.6 V. During cranking it should stay above roughly 9.6 V; a drop below that explains B1325 03 all by itself.
Tools: Multimeter
Check charging voltage the GM way
With the engine running and loads on (headlights, blower, rear defrost), expect roughly 13.5 to 14.8 V. Many newer GM vehicles lower the charge voltage at steady cruise to save fuel, so a reading around 12.8 to 13 V then isn't a fault by itself.
Tools: Multimeter
Voltage-drop test cables and grounds
While cranking, measure between the battery negative post and the engine block, and between the positive post and the starter or fuse block feed. More than about half a volt on either side means a bad cable end or ground that must be fixed.
Tools: Multimeter
Look for a parasitic drain
If the battery keeps going flat, measure current draw at the negative cable after the modules fall asleep, which can take a while on GM vehicles. A draw above roughly 50 milliamps needs tracing by pulling fuses one at a time.
Tools: Multimeter, Pliers
Check the feed to a single affected module
If only one module keeps logging B1325, check its fuse, power terminals and ground at the connector with the key on and a load running. A drop at that module only means a wiring or connector fault on its circuit.
Tools: Multimeter, Flashlight
Where the parts are
- 1Battery
- 2Alternator
- 3Engine computer (ECM)
- 4CAN bus
- 5Transmission
- 6Wheel speed sensor
- 7High-voltage battery
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Clean and tighten battery terminals | Yes | $0–$60 |
| Replace battery | Yes | $150–$300 |
| Replace battery cable or repair ground strap | Yes | $80–$300 |
| Find and fix a parasitic drain | No | $100–$400 |
| Replace alternator | No | $350–$800 |
Rough US estimates for parts and labor; shop rates vary by region. Not a quote.
Emissions / smog test impact
Usually passes
B1325 is stored in body modules and doesn't turn on the check engine light, so it won't fail an OBD emissions test. If a low-voltage event also set an engine code such as P0562 with the light on, that code would cause a failure until fixed.
Frequently asked questions
Does B1325 mean a module is bad?
Rarely. It's the module reporting that its power supply was out of range. Fix the battery, terminals, grounds or charging system first; only a single module that keeps setting the code with good supply points to that module's wiring.
Why did B1325 appear after a jump start?
The battery was low enough to drop voltage below the threshold, and jump-starting can add dips and spikes. The code stored during that event can simply be cleared once the battery is charged and tested.
What do the 03 and 07 at the end mean?
They're GM symptom bytes: 03 means the voltage was below the threshold and 07 means it was above. Low-voltage 03 is by far the most common and points to the battery or connections; 07 points to overcharging or a charger connected while driving.
My voltmeter reads about 13 V while cruising. Is my alternator bad?
Not necessarily. Many GM vehicles vary charging voltage based on battery condition and load, dropping it during steady driving. Check it with electrical loads switched on and at idle before condemning the alternator.
Sources
- Manufacturer public service information (cross-checked)
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