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2010 Ford F-150 4.6L Engine P0562 System Voltage Low - Troubleshooting & TSB Guidance

Model: 2010 ford f-150 4.6l Fault Code: P0562 Posted: 2025-12-23 19:39

I own a 2010 Ford F-150 with a 4.6L engine that has triggered DTC P0562 (System Voltage Low) in the transmission powertrain control module (PCM). The alternator was replaced about a year ago, and current charging voltage readings are stable at 13.5 to 14.5 volts when idling. However, during driving and upon coming to a stop with brake lights on, the fan running at high speed and headlights on, the voltage drops below 13.2 volts, fluctuating between 12.7 and -13.1 volts. I am aware of a Technical Service Bulletin (TSB) related to this issue — TSB #15-0137 — but I have checked fuse #27 and found it intact; I replaced it with a new one as a precaution. Upon disassembling the fuse box, I inspected the wiring under the fuse and did not observe any visible damage or burn marks. All electrical connections appear secure. My main question is: Should I proceed with the TSB procedures even if the wire shows no physical damage? And what other components or conditions should I check to diagnose this voltage drop accurately? Additionally, the TSB specifies that the vehicle must exhibit symptoms such as crank no-start, loss of RPM, or illuminated MIL with specific DTCs (e.g., P0230, P025A, P0627, U0109, etc.). Since my truck does not show these symptoms, I want to confirm whether this TSB applies to my 2010 F-150 model — especially considering the engine size (4.6L) and other configuration variations that may exclude it from coverage.

Related fault codes
P0562
Comments (3)
Anonymous 2025-12-24 11:13

I don't know which TSB you're referring to, so I can't provide specific advice on its applicability or procedure.

Anonymous 2025-12-24 17:31

The relevant TSB is TSB #15-0137. It outlines conditions under which the issue applies — specifically, whether the vehicle exhibits crank no-start, loss of RPM, or MIL illumination with DTCs such as P0230, P025A, P0627, U0109, P0201–P0208. The TSB covers 2009–2014 F-150 models but does not specify engine size or configuration. Therefore, you must evaluate whether your truck meets the listed symptoms to determine if this TSB applies to your situation.

Anonymous 2025-12-25 00:09

The TSB at https://static.nhtsa.gov/odi/tsbs/2015/...3-7690.pdf states that if the vehicle does not show crank no-start, RPM loss, or MIL illumination with DTCs like P0230, P025A, P0627, U0109, or any of the P0201–P0208 codes, then the TSB likely does not apply. Since your truck lacks these symptoms, it may fall outside the scope of this bulletin. However, verify that your 4.6L engine and model year are within the specified range (2009–2014 F-150), as configuration details can affect coverage.