What Does P258A Mean?
The PCM has detected a malfunction in the vacuum pump control circuit, either an open circuit or complete loss of control signal. The vacuum pump provides vacuum for brake booster and other vacuum-operated systems on engines without sufficient manifold vacuum.
Safety Warning
Critical safety concern as brake assist may be compromised, requiring significantly increased pedal effort. Do not drive until repaired.
Common Causes
35%
Failed vacuum pump motor or internal electrical fault
25%
Open circuit or damaged wiring to vacuum pump
20%
Blown fuse or faulty relay for vacuum pump
12%
Corroded or disconnected vacuum pump connector
8%
Failed PCM vacuum pump driver circuit
Diagnostic Steps
1
Step 1: Check vacuum pump fuse and relay operation, replace if blown/faulty
2
Step 2: Inspect vacuum pump connector for corrosion, damage, or loose connection
3
Step 3: Test for power and ground at vacuum pump connector with pump commanded on
4
Step 4: Check wiring continuity from PCM to vacuum pump and verify no open circuits
5
Step 5: Apply direct power to vacuum pump to verify motor operation
Estimated Repair Cost
$200 - $900
Parts + labor, varies by vehicle and location
The PCM has detected a malfunction in the vacuum pump control circuit, either an open circuit or complete loss of control signal. The vacuum pump provides vacuum for brake booster and other vacuum-operated systems on engines without sufficient manifold vacuum.
The most common cause of P258A (Vacuum Pump Control Circuit/Open) is: Failed vacuum pump motor or internal electrical fault
Typical repair costs for P258A range from $200 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Critical safety concern as brake assist may be compromised, requiring significantly increased pedal effort. Do not drive until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P258A to identify the root cause.
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Quick Info
Category
Powertrain
System
Vacuum System / Brake Assist
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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