What Does P1562 Mean?
The constant battery voltage supply (+BB or Keep Alive Memory) to the PCM has dropped below acceptable levels. This affects PCM memory retention and can cause driveability issues.
Common Causes
40%
Weak or failing battery with low voltage
25%
Corroded or loose battery cable connections
20%
Poor ground connection at PCM or battery
10%
Failing alternator not maintaining proper system voltage
5%
High resistance in PCM power supply circuit
Diagnostic Steps
1
Step 1: Measure battery voltage with engine off (should be 12.4-12.6V) and running (13.8-14.5V)
2
Step 2: Perform battery load test to verify battery capacity and health
3
Step 3: Clean and inspect all battery cable connections and ground points
4
Step 4: Measure voltage drop on positive and negative cables under load (should be less than 0.2V)
5
Step 5: Check voltage at PCM power supply pins with key on and engine running
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The constant battery voltage supply (+BB or Keep Alive Memory) to the PCM has dropped below acceptable levels. This affects PCM memory retention and can cause driveability issues.
The most common cause of P1562 (Powertrain Control Module +BB Voltage Low) is: Weak or failing battery with low voltage
Typical repair costs for P1562 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause unexpected stalling, loss of adaptive memory, or no-start conditions. Could potentially stall in traffic creating a safety hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1562 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electrical Power Supply / PCM
Difficulty
Type
Manufacturer
Recommended Tools
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