#voltage
8 posts in Car Diagnostics blog about "voltage" — OBD-II diagnostics, DTC codes, repair. ← All posts
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C1241: low or high battery voltage seen by the ABS module
An ABS code that is not about ABS. The module is reporting a supply problem, and the fix is at the battery rather than the brakes.
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P0882 and P0883: TCM power input signal low and high
The transmission module is reporting a supply problem. Every harsh shift and every limp mode that follows is a symptom, not a separate fault.
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Smart alternators: why your voltage swings and that is correct
Charging voltage that drops to 12.5 V under acceleration and jumps to 15 V on the overrun looks like a fault. On a modern car it is the design working.
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"Steering assist reduced": voltage before you condemn the rack
Electric power steering draws heavy current. That is why a message about the steering is so often a message about the battery.
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Electric car will not start: why the cheap battery is at fault, not the expensive one
The most common electric car failure is an ordinary lead-acid battery costing a hundred dollars. Why it works harder in a car with no engine than in a petrol one, and how to keep an eye on it.
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How to jump-start a car properly: the sequence that saves both cars' electronics
On a modern car, jump-starting incorrectly costs more than a new battery. The connection order, why the last clamp does not go where you think, and when you must not jump-start at all.
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Heavy steering: why it is often an electronic problem, not a mechanical one
Hydraulic assist gets heavy from fluid level and belts. Electric assist gets heavy from voltage, the angle sensor, and the speed signal. Both designs, and why on modern cars the culprit sits somewhere else entirely.
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Battery and alternator via OBD-II: P0562, P0620, diagnose in 5 minutes
What OBD-II says about the battery and alternator: codes P0562 (low voltage), P0563 (high), P0620 (alternator). How to read system voltage and why "overcharge" is more dangerous than "undercharge".